Hi Barrie garlick,
Since Instagram is now repeatedly asking you to sign in and accept cookies, I’d suggest resetting the app’s local data first, as its saved session may no longer be working correctly.
- Go to Settings > Apps > Installed apps > Instagram > Advanced options.
- Select Repair and test the app.
- If there’s no change, select Reset, then sign in again.
- If the issue remains, uninstall Instagram, restart the PC, and reinstall it from the Microsoft Store.
If notification links still cannot be opened after a clean reinstall, I’d also recommend reporting the behavior to Instagram/Meta, since the sign-in session and Instagram notification handling are controlled by their service.
I hope this helps narrow down where the problem is occurring.