My question was removed earlier by Mr.Glorfindel as it is a duplicate question.
So , actually there is no other option i can join, then I need the solution .If others are able to join , there must be some way from your site or app, you can fix the bug.
The thing is , I am not able to join physics stack exchange from both online and through the app. What is it that I should do ? I am reporting for this bug.