@CPeezy
This is a solution so you can erase those entries. It worked for me!
For it to work, you need to enable "show hidden files, folders or drives", close Microsoft Edge and restart in "safe mode".
Go here (notification folder) and delete all files inside this folder.
C:Users\yourusername\AppData\Local\Microsoft\Windows\Notification\
Last go into Registry editor (type regedit) in search bar and do a search "provider name you want to delete"...Delete all entries. After each search click F3 to keep searching and deleting.
Restart in normal mode and everything should be back to normal.