License Validation Error for Rhino 6 Educational Lab License

I purchased the lab license for 30 for Rhino 6. I was able to successfully download and validate the license on two computers, but after that every computer I tried to download and validate the license key on gives me an error message: License validation has encountered an error
code: 919

I am not using the Zoo or Cloud Zoo, but am using the single computer method. Please help. I have a workshop with educators in the morning and need to have the software loaded and laptops ready for use in the morning.
Thank you!

Please contact your regional office of McNeel directly - probably by telephone as it sounds urgent… @Bernat - do you know what this error code indicates?

@nickie.shira I see that you have already contacted us on support@mcneel.com
Let me get back to you through email since there might be an issue with your license key.

@Helvetosaur this error indicates that there is a validation issue with the email address used.

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