New Mac (to me) cannot activate business version with activation code?

Hi there
Tried numerous times and in numerous ways and still cannot activate the product to allow me to instal my billing app!
Been using a MacBook Pro for a few years where the company I consult for had helped me to activate the Parallels software. Just got given my husband has just given me his older iMac as it would be perfect to finally have a proper upright larger screen. Told my companies Parallels administrator I was moving over to the new computer and he sent me an email with a download button and activation code. I keep getting the error as shown in the picture:
PLEASE HELP! (cannot seem to get any support even after logging in, just a blank screen after typing in a subject matter)
Thanks
 

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