Update: It can now be tested by all users with the following link, which was shared by community member, @GemStadia – https://t.co/7MMjmTubqo?amp=1. Nice one Gem!
Starting this evening, it looks as though Stadia Messaging is being rolled out to users.
The news was shared by Twitter user @ipnagogico, and you can see a screenshot of the messaging notification below:

It roughly translates to:

With the rollout coming to web. Hopefully, it won’t be too long until this gets rolled out to the Stadia app. But one step at a time, eh?
Source:
https://stadiasource.com/article/1199/Stadia-Messaging-Appears-to-be-Rolling-Out
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