An authentication script must be provided with --manual-auth-hook

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If you have two domain names

you have to add two entries with the same name

_acme-challenge.relationmonitor.dk

and different values. Letsencrypt checks all values.

This

D:\temp>nslookup -type=txt _acme-challenge.relationmonitor.dk.

_acme-challenge.relationmonitor.dk      text =

        "j-Se0xBqqRtNrkXcmqWx99H0vLUf72-esM-WVTEtSqs"

_acme-challenge.relationmonitor.dk      text =

        "vrpWj5DzWHLVL1HgVjEN4UNue4J1qMevRgjhIwewokc"

looks good.