Deletion to
ttl must be greater than or equal 3600, see https://desec.readthedocs.io/en/latest/dns/domains.html#domain-object
Update dynv6 dns api to allow custom domains
Issue2547 wrong url construction for multiple dns services
Fix for issue in https://github.com/acmesh-official/acme.sh/issues/2336#issuecomment-670522738