Paramount plus/walmart plus/apple TV/iphone

I signed up for a free week subscription of Paramount+ on Apple TV on my iphone. Then I canceled it before the week was up, and it shows on my Apple TV subscriptions as canceled. Then got Walmart+ and Paramount+ comes free with it. So I downloaded the Paramount+ app on my iphone. I can sign into the Walmart+ Paramount+ account on the website on my PC, but on my iphone it just says login failed. The login that I am using is correct, it is the same one that I use on the website which does work. I contacted Paramount. They say Contact Apple and Walmart. I contacted Apple. They say contact Paramount and Walmart. I contacted Walmart and they say contact Paramount and Apple and the circle is complete and I still am not able to sign into the app on my iphone. Since those companies cannot help me with their products, I am hoping someone here might have an idea of what might work. Thanks!