Custom Token not added to Wallet

Hello,

i created my own BEP-20 token.
This is my code for the name and the symbol.

string private _name = “AlienToken”;
string private _symbol = “ALT”;
uint8 private _decimals = 9;

When i deploy it everything works fine but when i try to add it to metamask i always get the message that it failed:
“symbol must be 11 characters or fewer”

As you can see my code for the symbol is only 3 characters. Even when i try to use other codes from other people i aways get this message i dont know why.