Hello,
Thank you for posting in Q&A forum.
To troubleshoot this issue, please kindly try below steps:
1.Clear the browser cache or try with another browser and see if issue persists.
2.Check the SharePoint authentication settings.
3.Try to reset SharePoint distributed Cache and IIS by following commands:
Stop-SPDistributedCacheServiceInstance -Graceful
Start-SPDistributedCacheServiceInstance
iisreset
Best regards,
Jill Zhou
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