Workaround
Click "Yes" only once. If the second prompt shows up, simply ignore it and you'll join the Realm anyway.
When I try to join my friend's realm that requires a custom resource pack, it brings up the prompt to download it multiple times before it works. The resource pack only works for a few seconds before changing back to the previous one.
Linked issues
is duplicated by 3
Comments 2
Thank you for your report!
Minecraft Realms for Java Edition has received a lot of updates and fixes over the last two years, so this issue has probably already been fixed in the meantime (e.g. because it was a temporary outage or an issue with the base game).
Since this bug report has not been updated since at least two years, please let us know if this is still an issue in current versions of Minecraft and update the bug report if applicable. If this is no longer an issue, please let us know as well. Thanks!
This issue is being temporarily resolved as Awaiting Response. Once the requested information has been delivered, the report will be reopened automatically.
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Also, clicking "Yes" an even number of times will result in the Resource Pack being disabled, and the default textures will be used instead.