Boomer-- There's a missing clue here.

Normally all new bikes are set up with an RD which has enough capacity to take up ALL the chain from the big/big combination, to the small/small combination. While most people don't ride these because the high chain angle coming outer to inner or the opposite cause higher friction and wear, the bikes are set up to allow it just in case.

So what's missing is what happened since the bike left the factory.

Did someone put on a new chain which might be too long, change the RD to one with less capacity, or change the sprockets to ones requiring more capacity?

If you bought the bike used, you might not know the history, so your best bet is to use the method I suggested earlier to determine the minimum and maximum chain length, and size the chain accordingly (if possible). Remember, that if it's a capacity issue, that longer than minimum (big/big +1 inch) chain length is critical, and you might have to accept limitations on the small/small side. (you don't use this combination anyway).