Error 400 Invalid `success` param: URL host must be one of: localhost, cloud.appwrite.io, appwrite.i

Type : general_argument_invalid

I am building an ai chatbot that is hosted on my own website mywebsite.com under a subdomain of mybot.mywebsite.com with webpages

• "mybot.mywebsite.com/login.html" for the authentication page using OAuth2.0 with providers like Google
• "mybot.mywebsite.com/callback.html" for callback page to return from authetication page so that I can save the user info
• "mybot.mywebsite.com/chatbot.html" for the UX of chatbot, which calls appwrite function to get ai's response

To power my website, I have set up appwrite backend-as-a-service for oauth2.0 and I have written a few appwrite functions using python runtime

• chatbot function that takes a question and some additional context and responds with a line of text
• save-user-info function to save the user's information after successful authentication

The problem I am running into is that, when I call sdk.account.createOAuth2Session with "https://mybot.mywebsite.com/callback.html" as successful URL and "https://mybot.mywebsite.com/login.html for failure url, I am getting an error saying that the success URL needs to be a website using cloud.appwrite.io or appwrite.io

I saw a support entry asking to add my web page hostiong site to my appwrite project's "custom domains". I tried doing it and the website is getting (see attached)

and the error of

Error 400 Invalid success param: URL host must be one of: localhost, cloud.appwrite.io, appwrite.io
Type : general_argument_invalid

is persisting

When I "Retry certificate generation" - I am getting

Domain verification failed. Please check if your DNS records are correct and try again.

I presume there should be a simple fix and I am doing something stupid

What am I missing here?