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Sorry to hear you’re facing problems 
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Some or all of the below information will be requested if it isn’t supplied; for fastest response please provide as much as you can 
Nextcloud version (eg, 20.0.5): 21.0.0 Beta 8
Operating system and version (eg, Ubuntu 20.04): raspbian
Apache or nginx version (eg, Apache 2.4.25): 2.4.38
PHP version (eg, 7.4): 7.3.14
The issue you are facing:
Notification indicating update for Collabora Online is available. When I click on link I get a blank page
Is this the first time you’ve seen this error? Y:
Steps to replicate it:
- Click on Notification
- Click on link for Collabora Online update 3.7.14 in Notifications (blank page)
- Select Collabora Online from list of Active Apps
- Click on View in Store link
- Page https://apps.nextcloud.com/apps/richdocuments timesout.