The SRV is set to the best of my knowledge. It could take up to 24 hours for the Amplified server to show up in your multiplayer menu if you add this address now:
Server Address: amp.tektinkers.net
If you don't see "NickCraft" and you only see "TinkersCraft" the DNS's SRV hasn't globally propagated yet and could take up to 24 hours from now. (24Mar2025@10:25pm)
Fingers Crossed!!!