Unfortunately, the mobile apps aren't accessible by guest users, since they only have temporary accounts in order to chat in the specific room they've been invited to. Without a full-fledged account (with an email/password) the mobile apps aren't usable.
We do hope to add support for a more "permanent" level of guest user in the future, but it's not on our current roadmap. There are a few suggestions on our public JIRA (for example https://jira.atlassian.com/browse/HCPUB-1425) - you can go there to vote / watch / comment on them in order to be notified when progress happens.
Earlier this year we made the difficult decision to discontinue our team messaging tools, Stride and Hipchat. The end of life date for Stride and Hipchat Cloud is quickly approaching - February 15, 2...
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