What specific Tempo Button?
If you started the Trial, then you should have a valid license and everything should work. You may contact support.atlassin.com for problems like this.
If you don't have a correct license, or the plugin is disabled, and you are talking about the button in the agile board, then look at https://tempoplugin.jira.com/browse/TT-371
Cheers,
Mauro
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