Unable to activate existing license on new computer

Bought TurboTax 2023 in Dec (download) and activated it without issue.  I just  bought new computer and installed TT 2023 on it as well.  When prompted, I enter the License Key and it either does nothing or says my key is in error. I thought I had the option to make up to 5 installs? So far I have only used 1 (on the original computer).  Any suggestions?  Craig P