Description: Why is MetaMask not supporting incoming transactions for erc20 tokens
Purpose: It is pretty straight forward to get the list of incoming erc20 tokens transfers.
polygon scan API module=account&action=txlist ( MetaMask calls this for matic transfers etc)
if it calls module=account&action=tokentx
then MetaMask can show all kinds of token transfers ( incoming)
Extension/Mobile/Both: Extension, not sure if this is supported on mobile