Cannot read on Kobo Aura H20

[#1]

I can open books on my Win 10 PC
My Kobo was unable to open ebooks downloaded via ADE (4.5)

So I de-authorised and went to re-authorise

It is telling me user/password is wrong

I have successfully logged in using those so I know they are correct (although I do use 2FA)

What do I do next?

[#2]

I switched off 2FA and re-started ADE

Now I get the message "You can only authorize this computer with an Adobe ID that hasn't been previously used to authorize any other computer or mobile devices. Please try again"

[#3]

Uninstalled and reinstalled ADE

Removed Adobe Adept registry entries

Restarted ADE

Authorised Kobo

Now getting "Error getting License. License Server Communication Problem: E-GOOGLE_DEVICE_LIMIT_REACHED"

[#4]

Google were able to reset my device limit