I can resolve this according to https://github.com/bitcoin/bips/blob/master/bip-0353.mediawiki with:

dig phoenix.user._bitcoin-payment.arvin.dev TXT +dnssec

but when I try to decode the resulting offer with LNDK or CLN it runs to an error:

lndk-cli decode-offer lno1zrx...

Decoding offer: lno1zrx....

ERROR please provide offer starting with lno. Provided offer is invalid, failed to decode with error: Bech32(InvalidPadding).

lightning-cli pay lno1zrx...

{

"code": -32602,

"message": "Invalid bolt12: unexpected prefix lno"

}

What could be the issue?