Did a Gemini Query for your question and it returned these results. They have not be tested on my iPad
1. The "Mail Privacy" Fix
Many users have found that a specific privacy setting is preventing links from loading correctly after the update.
- Go to Settings > Apps > Mail.
- Tap on Privacy Protection.
- Toggle OFF "Protect Mail Activity."
- If it was already off, try toggling it on and back off again. Restart the Mail app and check the link.
Force Restart your iPad
Since 26.2 is a major system update, a standard "slide to power off" often isn't enough to clear cached background processes that handle URL redirection.
- Press and quickly release the Volume Up button.
- Press and quickly release the Volume Down button.
- Press and hold the Top button (Power button) until the Apple logo appears, then release.
Clear Safari Cache
Because the Mail app uses Safari’s engine to open links, a corrupted browser cache can cause links to "hang."
- Go to Settings > Apps > Safari.
- Scroll down and tap Clear History and Website Data.
- Select "All History" and tap Clear History.
Check Content Restrictions
Sometimes updates can trigger "Screen Time" restrictions that accidentally block web content.
- Go to Settings > Screen Time > Content & Privacy Restrictions.
- If enabled, check Content Restrictions > Web Content and ensure it is set to "Unrestricted."
Pro-Tip (Workaround):
If you need to open a link immediately and it still isn't clicking, try long-pressing the link. A context menu should appear. If it does, select "Copy Link" and paste it directly into your browser address bar.
Hope one of the tips help in sorting out the problem