To fix it I had to delete the Beehaw.org cookies using the following method:
Click the menu (three dots) button.
In the menu that then opens click “Settings”.
Click “Cookies and site permissions” in the list on the left.
Click “Manage and delete cookies and site data” at the top of the list in the centre.
Click “See all cookies and site data”. This is located fourth option from the top. The last option in the first block of options in the centre.
Type “beehaw.org” in the “Search cookies” box at the top right (or just scroll through the list until you find it.)
Click the chevron/down arrow on the right hand side of the beehaw.org entry. Then click all the little trashcan icons next to the beehaw.org cookies to delete them (I had two, but now only have one. Make sure they are only the ones marked beehaw or you may delete cookies from other sites if you chose to scroll rather than search.)
Can’t remember if I used “ctrl + F5” on the log in page to cleanly refresh it but it probably wouldn’t hurt.-
I also had trouble signing back in again on Edge.
To fix it I had to delete the Beehaw.org cookies using the following method: