WordPress Single Sign-on and Persistent Sessions Across Different Domains

I’m trying to implement a single set of credentials across multiple WordPress installs that sit on the same server but on different domains entirely. e.g. squirrel.com, badger.es, horse.coffee.

I have been looking at auth0 for sharing credentials, but I still need to login using those same shared, valid, credentials on each individual site, where ideally I could visit one of the other sites and be already authenticated.

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Is this possible using auth0 or some similar method? Should I be looking at multisite instead?

Any suggestions are welcome. Thank you

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