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For Any one who might come across this issue and are having the same problem I ended up having to enable "Send prefix hint" on the WAN interface.

I'm migrating from PFSense to OPNSense, Ive managed to get everything working except IPv6.

My ISP is IDNet they support IPv6 via DHCPv6 with a /48 prefix size using the IPv4 link connectivity which was working with PFSense.

When configuring just the PPPoE connection for IPv4 connectivity everything is working.

When I enable DHCPv6 on the WAN interface with a /48 prefix and selecting "Use IPv4 connectivity" it appears to briefly connect for a split second and then disconnect doing this repeatedly.

Looking at the PPP logs it is showing "LCP: parameter negotiation failed"

I have restarted OPNSense, restarted the ONT, confirmed theese were the same settings as before.

Here are the PPP logs from starting to stopping for a connection attempt:

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<30>1 2025-01-25T03:01:40+00:00 OPNsense ppp 53338 - [meta sequenceId="955"] [wan_link0] Link: reconnection attempt 1 in 4 seconds
<30>1 2025-01-25T03:01:44+00:00 OPNsense ppp 53338 - [meta sequenceId="956"] [wan_link0] Link: reconnection attempt 1
<30>1 2025-01-25T03:01:44+00:00 OPNsense ppp 53338 - [meta sequenceId="957"] [wan_link0] PPPoE: Set PPP-Max-Payload to '1500'
<30>1 2025-01-25T03:01:44+00:00 OPNsense ppp 53338 - [meta sequenceId="958"] [wan_link0] PPPoE: Connecting to ''
<30>1 2025-01-25T03:01:44+00:00 OPNsense ppp 53338 - [meta sequenceId="959"] PPPoE: rec'd ACNAME "BNG4.THN-LON-RE0"
<30>1 2025-01-25T03:01:44+00:00 OPNsense ppp 53338 - [meta sequenceId="960"] [wan_link0] PPPoE: rec'd PPP-Max-Payload '1500'
<30>1 2025-01-25T03:01:44+00:00 OPNsense ppp 53338 - [meta sequenceId="961"] [wan_link0] PPPoE: connection successful
<30>1 2025-01-25T03:01:44+00:00 OPNsense ppp 53338 - [meta sequenceId="962"] [wan_link0] Link: UP event
<30>1 2025-01-25T03:01:44+00:00 OPNsense ppp 53338 - [meta sequenceId="963"] [wan_link0] LCP: Up event
<30>1 2025-01-25T03:01:44+00:00 OPNsense ppp 53338 - [meta sequenceId="964"] [wan_link0] LCP: state change Starting --> Req-Sent
<30>1 2025-01-25T03:01:44+00:00 OPNsense ppp 53338 - [meta sequenceId="965"] [wan_link0] LCP: SendConfigReq #28
<30>1 2025-01-25T03:01:44+00:00 OPNsense ppp 53338 - [meta sequenceId="966"] [wan_link0]   PROTOCOMP
<30>1 2025-01-25T03:01:44+00:00 OPNsense ppp 53338 - [meta sequenceId="967"] [wan_link0]   MRU 1500
<30>1 2025-01-25T03:01:44+00:00 OPNsense ppp 53338 - [meta sequenceId="968"] [wan_link0]   MAGICNUM 0x8eca3cac
<30>1 2025-01-25T03:01:44+00:00 OPNsense ppp 53338 - [meta sequenceId="969"] [wan_link0] LCP: rec'd Configure Request #66 (Req-Sent)
<30>1 2025-01-25T03:01:44+00:00 OPNsense ppp 53338 - [meta sequenceId="970"] [wan_link0]   AUTHPROTO CHAP MD5
<30>1 2025-01-25T03:01:44+00:00 OPNsense ppp 53338 - [meta sequenceId="971"] [wan_link0]   MAGICNUM 0x0b0ec800
<30>1 2025-01-25T03:01:44+00:00 OPNsense ppp 53338 - [meta sequenceId="972"] [wan_link0] LCP: SendConfigAck #66
<30>1 2025-01-25T03:01:44+00:00 OPNsense ppp 53338 - [meta sequenceId="973"] [wan_link0]   AUTHPROTO CHAP MD5
<30>1 2025-01-25T03:01:44+00:00 OPNsense ppp 53338 - [meta sequenceId="974"] [wan_link0]   MAGICNUM 0x0b0ec800
<30>1 2025-01-25T03:01:44+00:00 OPNsense ppp 53338 - [meta sequenceId="975"] [wan_link0] LCP: state change Req-Sent --> Ack-Sent
<30>1 2025-01-25T03:01:44+00:00 OPNsense ppp 53338 - [meta sequenceId="976"] [wan_link0] LCP: rec'd Configure Ack #28 (Ack-Sent)
<30>1 2025-01-25T03:01:44+00:00 OPNsense ppp 53338 - [meta sequenceId="977"] [wan_link0]   PROTOCOMP
<30>1 2025-01-25T03:01:44+00:00 OPNsense ppp 53338 - [meta sequenceId="978"] [wan_link0]   MRU 1500
<30>1 2025-01-25T03:01:44+00:00 OPNsense ppp 53338 - [meta sequenceId="979"] [wan_link0]   MAGICNUM 0x8eca3cac
<30>1 2025-01-25T03:01:44+00:00 OPNsense ppp 53338 - [meta sequenceId="980"] [wan_link0] LCP: state change Ack-Sent --> Opened
<30>1 2025-01-25T03:01:44+00:00 OPNsense ppp 53338 - [meta sequenceId="981"] [wan_link0] LCP: auth: peer wants CHAP, I want nothing
<30>1 2025-01-25T03:01:44+00:00 OPNsense ppp 53338 - [meta sequenceId="982"] [wan_link0] LCP: LayerUp
<30>1 2025-01-25T03:01:45+00:00 OPNsense ppp 53338 - [meta sequenceId="983"] [wan_link0] CHAP: rec'd CHALLENGE #128 len: 37
<30>1 2025-01-25T03:01:45+00:00 OPNsense ppp 53338 - [meta sequenceId="984"] [wan_link0]   Name: "BNG4.THN-LON"
<30>1 2025-01-25T03:01:45+00:00 OPNsense ppp 53338 - [meta sequenceId="985"] [wan_link0] CHAP: Using authname "FTTP.**************@idnet"
<30>1 2025-01-25T03:01:45+00:00 OPNsense ppp 53338 - [meta sequenceId="986"] [wan_link0] CHAP: sending RESPONSE #128 len: 38
<30>1 2025-01-25T03:01:45+00:00 OPNsense ppp 53338 - [meta sequenceId="987"] [wan_link0] LCP: rec'd Configure Request #2 (Opened)
<30>1 2025-01-25T03:01:45+00:00 OPNsense ppp 53338 - [meta sequenceId="988"] [wan_link0]   MRU 1500
<30>1 2025-01-25T03:01:45+00:00 OPNsense ppp 53338 - [meta sequenceId="989"] [wan_link0]   AUTHPROTO CHAP MD5
<30>1 2025-01-25T03:01:45+00:00 OPNsense ppp 53338 - [meta sequenceId="990"] [wan_link0]   MAGICNUM 0x0b0ec800
<30>1 2025-01-25T03:01:45+00:00 OPNsense ppp 53338 - [meta sequenceId="991"] [wan_link0] LCP: LayerDown
<30>1 2025-01-25T03:01:45+00:00 OPNsense ppp 53338 - [meta sequenceId="992"] [wan_link0] LCP: parameter negotiation failed
<30>1 2025-01-25T03:01:45+00:00 OPNsense ppp 53338 - [meta sequenceId="993"] [wan_link0] LCP: state change Opened --> Stopping
<30>1 2025-01-25T03:01:45+00:00 OPNsense ppp 53338 - [meta sequenceId="994"] [wan_link0] LCP: SendTerminateReq #29
<30>1 2025-01-25T03:01:45+00:00 OPNsense ppp 53338 - [meta sequenceId="995"] [wan_link0] LCP: LayerDown

If anyone knows what might be the issue or what parameters it is failing to negotiate that would be very appreciated :)