It's a little complicated. There's pre tax reimbursement and after tax reimbursement.
By law your employer can only give you $5250 maximum, tax free. If your tuition was less than that, and you employer reimbursed it all; it’s safe to assume you cannot claim a credit. You do not even need to enter your 1098-T. You have nothing to claim.
If you got more than $5250, the amount above $5250 is usually already included in box 1 of your w-2. Since you have essentially paid tax on that part, it is considered your after tax money and that amount can be used to claim the tuition credit.