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Have you tried updating / reinstalling Gmail App?
I'm looking at the app on my phone right now and I can choose account type
I think I solved my problem, for some reason I didn't have the Mail app on my phone that's why I tried both Gmail and Outlook, mail.
I'm not trying to combine them, I'm just trying to import tpg into Gmail or outlook, so instead of having four different apps for my mail I only have one which I could open and see the mail accounts. But I have just decided to ditch my Tpg mail and keep using my gmail and outlook accounts, thank you for your patience, Oscar.