Hi @Matthias68 ,
Good day! Welcome to Q&A forum.
After upgrading to SharePoint Server 2019 (SE), if your RSS feed button leads to an empty page, this is typically caused by missing or misconfigured RSS features. Please verify the following settings.
- Verify and Activate RSS Features
At Site Collection Level:
Enable-SPFeature -Identity "RSSFeedSite" -Url <YourSiteURL>
At Web Application Level:
Enable-SPFeature -Identity "RSSFeedWeb" -Url <YourWebAppURL>
- Check Subscription Settings Service
- Go to Central Administration → Application Management → Manage Service Applications
- Verify "Subscription Settings Service" is started
Besides, you can try to subscribe to a blog site via RSS in SharePoint SE directly.
Here is an article about RSS feed for your reference:
Create or subscribe to an RSS Feed - Microsoft Support
Hope these information helps.
Please do let us know if you have any further queries.
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