Hi Maryanne,
I've never seen Commons accessed that way without already being logged in. The typical way (I think) would be to log in to your Canvas instance and click the Commons link on the left side of the global navigation. When you do this you should already be logged in to Commons through you Canvas instance. I'd suggest trying to go in to Commons that way, searching for the content and loading it into your course that way. https://community.canvaslms.com/docs/DOC-16712-4152725288
For what it's worth, when I try to access Commons directly like you did using https://lor.instructure.com, I get the same error when trying to log in.
If you don't see the link to Commons on the left side of Canvas it could be that your school has access disabled. In that case I suggest you talk to your local Canvas Admins or IT department about getting access at your school.
Good luck,
Rick
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