Update Friday 27th March
If experiencing issues with Teams then download and install the Teams app instead >> https://teams.microsoft.com/downloads
The app is available on PCs, laptops, phones and tablets. It bypasses the GLOW part of things and connects directly to the Microsoft part of their/your GLOW account.
You will need to remember that your Microsoft username (for an Ms apps such as Teams, Word, Powerpoint, Excel etc) is your GLOW username @glow.sch.uk (example firstname.lastname@example.org).