I have loaded Minecraft client 1.17 and attempted to launch a realms account. Realms told me the client was not supported and I must load Java 1.16.5
When will realms be supported by v. 1.17?
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Thanks, had me wondering. Looked through all the change logs, Mojang Twitter/support page and couldn't find anything referencing realms and the 1.17 update

Only the admin of a Realm can trigger the upgrade. There are people talking about it on Reddit and how it is succeeding.
Realms probably hasn't updated yet. It should be up for 1.17 no later than 2 days from now.