CNT is right, that error came around last week after users were prompted to "Restart their Browser" and the solution was to get the administrator to re-assign trial licenses to some people.
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Check out the new Power Platform Community Connections gallery!
Congratulations, the new Super User Season 2 for 2021 has started!
Power Platform release plan for the 2021 release wave 2 describes all new features releasing from October 2021 through March 2022.