Are you able to sign into the app under your administrator’s account? I’ve included below a different set of instructions for you to try that may help. You should be able to give permissions directly through the app, so please let us know if this does or doesn’t work for you.
Make sure you are completely logged out of Microsoft. This isn’t normally necessary but will reduce the numbers of errors that could occur when logging in for the first time. You can use Chrome’s Incognito Mode, Firefox’s Private Browsing, or Edge’s InPrivate mode to guarantee that you aren’t logged in anywhere.
Access the application via https://edu.sketchup.com/app 3 and select the “Sign in with Microsoft” option when prompted.
A pop up window should appear. Make sure it isn’t hidden behind the main browser window! If a pop up window does not appear make sure your browser allows pop ups for the edu.sketchup.com domain and reload the webpage.
Next, complete Microsoft’s login workflow using an administrative account for your domain.
Once you select the “Consent on behalf of your organization” and click “Accept” students should be able to login to the application also! If you see a different window it may mean that you are not using an account that has application consent permissions for your organization.