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Thanks, @devender for reaching out to help!
I got in touch with Metamask support, and they sorted it out.

@superstar2018 I am glad to hear that :)

so, is it possible to edit the incorrect decimals of precision that I entered before. I put 3 instead of 18 and now metamask shows a really big umber of tokens. I know when I check at https://ethplorer.io/ the number of tokens is right but the metamask representation is wrong. Can I delete the added token and add it again or edit the decimals of precision?

I don't see any option to delete

no in metamask seem to only be able to hide