ChatGPT's mobile website (chat.openai.com)'s log in button is not responsive on click on all browsers for ios/iPadOS systems below version 15. This is not a server issue or temporary issue or cache issue. It has been failing like this for more than a month. There is a bug in ChatGPT's mobile website's code. Please read this post for more details:
https://apple.stackexchange.com/questions/466071/cannot-login-on-chatgpt-mobile-website-chat-openai-com-on-ios-14-ipados-14
and also this post:
https://www.reddit.com/r/jailbreak/comments/17fzbh3/ios141_as_of_today_i_cant_log_in_or_use_chatgpt/
I used to use the mobile site (chat.open.com) just fine. However, starting from two weeks ago, all the browsers on my iPhone (iOS 14) and iPad (iPadOS 14) cannot log into my chatGPT account success...