I had exact the same problem after updating to 25.1. I got it to work by changing the "User naming attribute" from "userPrincipalName" to "sAMAccountName"
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Show posts Menunslookup testserver.mc.local
nslookup testwebsite.mycompany.com
nslookup testserver.mc.local 172.16.0.10 #DNS Server at Site, not opnSense
nslookup testwebsite.mycompany.com 172.16.0.10
ping testserver.mc.local
ping testwebsite.mycompany.com
DNS Default Domain: mc.local
DNS Domain search list: mycompany.com
DNS Servers 172.16.0.10
Force DNS cache update: tested, no difference
Prevent DNS leaks: tested, no difference
redirect gateway: false (when true, it does work)
IPv4 Local Network: 172.16.0.0/16
2022-04-29T14:39:44 openvpn[52367] test_pcsm/XXX.XXX.XXX.XXX:49277 MULTI: bad source address from client [192.168.78.76], packet dropped
2022-04-29T14:39:44 openvpn[52367] test_pcsm/XXX.XXX.XXX.XXX:49277 GET INST BY VIRT: 192.168.78.76 [failed]
route to: 172.24.240.1
destination: 172.24.240.1
fib: 0
interface: lo0
flags: <UP,HOST,DONE,STATIC,PINNED>
recvpipe sendpipe ssthresh rtt,msec mtu weight expire
0 0 0 0 16384 1 0
route to: 172.24.240.2
destination: 172.24.240.2
fib: 0
interface: ovpns3
flags: <UP,HOST,DONE,PINNED>
recvpipe sendpipe ssthresh rtt,msec mtu weight expire
0 0 0 0 1500 1 0
route to: 172.24.0.1
destination: 172.24.0.1
fib: 0
interface: lo0
flags: <UP,HOST,DONE,STATIC,PINNED>
recvpipe sendpipe ssthresh rtt,msec mtu weight expire
0 0 0 0 16384 1 0
route to: 172.26.0.1
destination: 172.26.0.0
mask: 255.255.0.0
gateway: 172.24.240.2
fib: 0
interface: ovpns3
flags: <UP,GATEWAY,DONE,STATIC>
recvpipe sendpipe ssthresh rtt,msec mtu weight expire
0 0 0 0 1500 1 0
route to: 172.24.240.1
destination: 172.24.240.1
fib: 0
interface: ovpnc1
flags: <UP,HOST,DONE,PINNED>
recvpipe sendpipe ssthresh rtt,msec mtu weight expire
0 0 0 0 1500 1 0
route to: 172.24.240.2
destination: 172.24.240.2
fib: 0
interface: lo0
flags: <UP,HOST,DONE,STATIC,PINNED>
recvpipe sendpipe ssthresh rtt,msec mtu weight expire
0 0 0 0 16384 1 0
route to: 172.24.0.1
destination: 172.24.0.0
mask: 255.254.0.0
gateway: 172.24.240.1
fib: 0
interface: ovpnc1
flags: <UP,GATEWAY,DONE,STATIC>
recvpipe sendpipe ssthresh rtt,msec mtu weight expire
0 0 0 0 1500 1 0
route to: 172.26.0.1
destination: 172.26.0.1
fib: 0
interface: lo0
flags: <UP,HOST,DONE,STATIC,PINNED>
recvpipe sendpipe ssthresh rtt,msec mtu weight expire
0 0 0 0 16384 1 0
Routing tables
Internet:
Destination Gateway Flags Netif Expire
default XXX.XXX.XXX.XXX UGS vtnet1
...
127.0.0.1 link#5 UH lo0
172.24.0.0/24 link#16 U vtnet0_v
172.24.0.0/22 link#16 U vtnet0_v
172.24.0.1 link#16 UHS lo0
172.24.0.2 link#16 UHS lo0
172.24.8.0/24 link#10 U vtnet0_v
172.24.8.1 link#10 UHS lo0
172.24.8.2 link#10 UHS lo0
172.24.12.0/24 link#11 U vtnet0_v
172.24.12.1 link#11 UHS lo0
172.24.12.2 link#11 UHS lo0
172.24.16.0/24 link#15 U vtnet0_v
172.24.16.1 link#15 UHS lo0
172.24.16.2 link#15 UHS lo0
172.24.20.0/24 link#17 U vtnet0_v
172.24.20.1 link#17 UHS lo0
172.24.20.2 link#17 UHS lo0
172.24.24.0/24 link#18 U vtnet0_v
172.24.24.1 link#18 UHS lo0
172.24.24.2 link#18 UHS lo0
172.24.28.0/24 link#14 U vtnet0_v
172.24.28.1 link#14 UHS lo0
172.24.28.2 link#14 UHS lo0
172.24.32.0/24 link#41 U vtnet0_v
172.24.32.1 link#41 UHS lo0
172.24.32.2 link#41 UHS lo0
172.24.240.0/24 172.24.240.2 UGS ovpns3
172.24.240.1 link#12 UHS lo0
172.24.240.2 link#12 UH ovpns3
172.24.248.0/24 link#3 U vtnet2
172.24.248.2 link#3 UHS lo0
172.25.0.0/22 link#20 U vtnet0_v
172.25.0.1 link#20 UHS lo0
172.25.0.2 link#20 UHS lo0
172.25.4.0/22 link#21 U vtnet0_v
172.25.4.1 link#21 UHS lo0
172.25.4.2 link#21 UHS lo0
172.25.8.0/22 link#22 U vtnet0_v
172.25.8.1 link#22 UHS lo0
172.25.8.2 link#22 UHS lo0
172.25.12.0/22 link#23 U vtnet0_v
172.25.12.1 link#23 UHS lo0
172.25.12.2 link#23 UHS lo0
172.25.16.0/22 link#24 U vtnet0_v
172.25.16.1 link#24 UHS lo0
172.25.16.2 link#24 UHS lo0
172.25.20.0/22 link#25 U vtnet0_v
172.25.20.1 link#25 UHS lo0
172.25.20.2 link#25 UHS lo0
172.25.24.0/22 link#26 U vtnet0_v
172.25.24.1 link#26 UHS lo0
172.25.24.2 link#26 UHS lo0
172.25.28.0/22 link#27 U vtnet0_v
172.25.28.1 link#27 UHS lo0
172.25.28.2 link#27 UHS lo0
172.25.32.0/22 link#28 U vtnet0_v
172.25.32.1 link#28 UHS lo0
172.25.32.2 link#28 UHS lo0
172.25.36.0/22 link#29 U vtnet0_v
172.25.36.1 link#29 UHS lo0
172.25.36.2 link#29 UHS lo0
172.25.40.0/22 link#30 U vtnet0_v
172.25.40.1 link#30 UHS lo0
172.25.40.2 link#30 UHS lo0
172.25.44.0/22 link#31 U vtnet0_v
172.25.44.1 link#31 UHS lo0
172.25.44.2 link#31 UHS lo0
172.25.48.0/22 link#32 U vtnet0_v
172.25.48.1 link#32 UHS lo0
172.25.48.2 link#32 UHS lo0
172.25.52.0/22 link#42 U vtnet0_v
172.25.52.1 link#42 UHS lo0
172.25.52.2 link#42 UHS lo0
172.25.56.0/22 link#8 U vtnet0_v
172.25.56.1 link#8 UHS lo0
172.25.56.2 link#8 UHS lo0
172.25.128.0/24 link#38 U vtnet0_v
172.25.128.1 link#38 UHS lo0
172.25.128.2 link#38 UHS lo0
172.25.232.0/22 link#33 U vtnet0_v
172.25.232.1 link#33 UHS lo0
172.25.232.2 link#33 UHS lo0
172.25.236.0/22 link#34 U vtnet0_v
172.25.236.1 link#34 UHS lo0
172.25.236.2 link#34 UHS lo0
172.25.240.0/22 link#35 U vtnet0_v
172.25.240.1 link#35 UHS lo0
172.25.240.2 link#35 UHS lo0
172.25.244.0/22 link#36 U vtnet0_v
172.25.244.1 link#36 UHS lo0
172.25.244.2 link#36 UHS lo0
172.25.248.0/22 link#37 U vtnet0_v
172.25.248.1 link#37 UHS lo0
172.25.248.2 link#37 UHS lo0
172.25.252.0/24 172.25.252.2 UGS ovpns2
172.25.252.1 link#40 UHS lo0
172.25.252.2 link#40 UH ovpns2
172.25.253.0/24 172.25.253.2 UGS ovpns1
172.25.253.1 link#39 UHS lo0
172.25.253.2 link#39 UH ovpns1
172.26.0.0/16 172.24.240.2 UGS ovpns3
Routing tables
Internet:
Destination Gateway Flags Netif Expire
default 172.26.124.20 UGS vtnet1
127.0.0.1 link#5 UH lo0
172.24.0.0/15 172.24.240.1 UGS ovpnc1
172.24.240.0/24 172.24.240.1 UGS ovpnc1
172.24.240.1 link#11 UH ovpnc1
172.24.240.2 link#11 UHS lo0
172.26.0.0/22 link#9 U vtnet0_v
172.26.0.1 link#9 UHS lo0
172.26.0.2 link#9 UHS lo0
172.26.8.0/24 link#10 U vtnet0_v
172.26.8.1 link#10 UHS lo0
172.26.8.2 link#10 UHS lo0
172.26.12.0/24 link#12 U vtnet0_v
172.26.12.1 link#12 UHS lo0
172.26.12.2 link#12 UHS lo0
172.26.120.0/24 link#3 U vtnet2
172.26.120.2 link#3 UHS lo0
172.26.124.0/24 link#2 U vtnet1
172.26.124.1 link#2 UHS lo0
172.26.124.2 link#2 UHS lo0
192.168.78.0/24 link#4 U vtnet3
192.168.78.2 link#4 UHS vtnet3
192.168.78.81 link#4 UHS lo0
Internet6:
...