Can someone else pay my IRS tax debt with their direct debit account when filing through turbotax?

Yes, just be sure that the other person is aware of the amount charged to the debit card.

If you mean a direct debit bank account (like a checking or savings account), then probably not since most banks will deny any access if the name on the debit does not match the name on the account.   Ask the bank if they will allow it.

Yes, just be sure that the other person is aware of the amount charged to the debit card.

If they are paying during filing my turbo tax using their checking account information will it be an issue?

Yes - see my comment above.

"If you mean a direct debit bank account (like a checking or savings account), then probably not since most banks will deny any access if the name on the debit does not match the name on the account.   Ask the bank if they will allow it."

Try here:

https://www.irs.gov/payments