Update sending domain: Unable to retrieve the TXT records for your domain name.

You need to add proper email selector as the TXT record, follow the exact steps mailwizz tells you to follow.
mailer._domainkey.jahresparty.ch IN TXT v=DKIM1; k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDOEGOxFwZWWcx8x1tr21xS9C6lZnoVavAtCaxaMGFIiFpD1w1TTO556LcXUp0QJv+eXYWbs+jNcDP7KEFia+JRiKMepPvfsG2mwqXLB9mB66oWbhVqCLuyEHxMb0cr1R/3ZXvm8STUxNpTHf5O32jtFSUZ2cQ2az3mZUJGVB8U5QIDAQAB;
 
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