I must say that I I don't know what could be causing this. It sounds like the tokens that we generate for the sidebar contents are somehow expiring or otherwise invalid, but I cannot reproduce that with e.g. Stand-up.
I think your best bet is to contact HipChat Support, maybe they have had similar cases and would be able to help you.
All good things come to an end - thanks to all our customers and partners who have been along the Hipchat and Stride journey with us. As of Feb 15th 2019, Hipchat Cloud and Stride have reached ...
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