Having trouble installing Helpdesk Widget from SharePoint store for Sharepoint Online site

When I try to add the Plumsail HelpDesk Widget via the SharePoint Store classic experience, it states that it has a problem with the license and I should navigate back to the site and try adding again. Unfortunately, this is just putting me in a constant loop where I end up with the same result. I'm following the step by step help article but is there a step that I am missing?

Please ensure that the account you use to install the HelpDesk widget is added to the site owner group. Let me know whether it helped.

Thanks for your response. The account used is indeed a member of the Site Owner group with Full Control permissions. Also attempted this at the top-level site within our Sharepoint environment to which the account is also listed as site owner.

I have reported the case to developers and will inform you about their advice.

Before adding the HelpDesk widget, please go to the license management:

Then delete the existing HelpDesk widget license, clear the browser cache, ensure that you use the user that is added to the SharePoint site owner group:

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Try to install the widget again.