Moz API Error Messages

I'm just getting started with SEO Tools, and I'm getting this error message repeatedly:

As soon as I close one, another opens.

Any idea what the issue is or how to resolve it?

Thanks!

Hi Chris,

This is typically because of Moz API request restrictions such as number of calls and throttling. Are you using a paid license?

I'm using a free trial account from Moz.

But, after posting this, I used the same Moz API credentials to import Domain Authority using another piece of software. To that end, these error messages seem specific to SEO Tools--rather than the Moz API or my Moz account.

Can you suggest a remedy that will allow me to use the Moz API with SEO Tools successfully?