To check the information of Microsoft Office product, please search CMD, right-click the Command Prompt and run as administrator. Then copy and paste the command in it, click Enter at last:
cscript.exe "%ProgramFiles%\Microsoft Office\Office16\ospp.vbs" /dstatus
(If you are running 32-bit Office on a 64-bit operating system)
cscript.exe "%ProgramFiles(x86)%\Microsoft Office\Office16\ospp.vbs" /dstatus
Then you may copy all result or take a screeshot to share with us.
Besides, I need to I confirm that if you remember the Microsoft account that was bound to the license of Office 2019 Home & Student before.
As if needed, we may re-insall the Office Home & Student 2019, but this action need you to log into Services & subscriptions.
Here is an article "Download and install or reinstall Microsoft 365 or Office 2019 on a PC or Mac", you may also have a look.
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