1099R box 2b taxable amount not determined

Te_ariki

I received some advice to use my Roth IRA as a savings account (I'm not retired) so that my funds can be invested and not sitting in the bank, as long as I don't withdraw any growth that those funds had. This past year I needed a chuck to make a larger purchase and took it from my Roth. I took out an amount less than I have contributed to the account.

Now I'm getting a 1099-R from my Roth brokerage and in box 2a (taxable amount) the box is blank, and in box 2b the 'taxable amount not determined' is checked.

Does that mean this money won't be taxed/affect my AGI? Or are there other things it looks at to determine how much will be taxed or increase my AGI?