I'm not able to sign into AMC channel although I already have an account with them. I'm also unable to sign in because I don't have a TV Provider. I use my phone wifi hotspot
When a channel asks for your TV provider, they are checking to make sure you are already paying them through a TV provider such as cable TV, satellite, SlingTV etc. Some channels only work this way. Others also have a way to pay them directly: eg: HBO has HBOMax, CBS has Paramount+ etc.
Is this any help? https://sites.google.com/site/amccomactivate/