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That is it exactly:
https://github.com/opnsense/core/issues/9135

I switched to Kea and using dhcpv6.  I noticed that Android 16 devices started to work with and use ipv6.  I found that each device was requesting a dedicated prefix.  Appears strange and wasteful.   I looked into this and found an article:
android-developers.googleblog.com/2025/09/simplifying-advanced-networking-with.html

I am using OPNsense 25.7.4 and PFSense. The OPNsense has some sort of issue with the dhcpv6, prefix delegation, and routing.  I think the routes are not being created for prefix delegation.  I found that PFsense appears to work with the dhcpv6, and prefix delegation without a problem.

24.7.2
Clean install not upgrade.
I see an error on console:
HTTPS: Could not open file or uri for loading certificate from /var/etc/cert.pem
00206149AD9D0000:error:16000069:STORE routines:ossl_store_get0_loader_int:unregistered scheme:/usr/src/crypto/openssl/crypto/store/store_register.c:237:scheme=file
00206149AD9D0000:error:80000002:system library:file_open:No such file or directory:/usr/src/crypto/openssl/providers/implementations/storemgmt/file_store.c:267:calling stat(/var/etc/cert.pem)
Unable to load certificate

OPNsense 24.1 aarch64 ....  is working well on Orange Pi 5 Plus.

Would you mind sharing your build or the steps you took? I'm trying to get it working on my OPI5+ as well. Thank you.

The first step is to change the firmware of the OPI5+ to use EDK2 firmware.
https://github.com/edk2-porting/edk2-rk3588
If you do that then you can use the OPNsense images.

I noticed that when creating the cloudflare api token, Acme required:
Zone Resources set: Include | All zones.   This appears to be the problem.
To sum it up:
Zone | DNS | Edit
Zone Resources | Include | All Zones
Client IP (not using this field)
TTL | set a valid date range
This appears to work OK.

OPNsense 24.1 aarch64 ....  is working well on Orange Pi 5 Plus.

Update to 24.1 r1 went fine.  Everything seems to be working normally.

This is really good work!  I am now running on orange pi 5 plus.  There were no problems at all.