That's a service that doesn't want your business. If you care, message them about it

I've never once run into a service with such a restriction, but I can imagine someone being that short-sighted. I have seen services that only support "log in with Google or Facebook", which is comparably terrible.

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genxy 3 hours ago | parent | next [-]

Discogs will not let me login with my own domain (of 30 years) and required one of the big providers. It kept complaining about "risky domain". But that is the only incident I can think of.

	▲	CamperBob2 an hour ago \| parent [-]
		Discogs Who? Never heard of them, and it sounds like there's a good reason for that.

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sir0010010 2 hours ago | parent | prev [-]

I've run into services that will flag specific tlds as invalid.