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Sorry that you're getting the error "can't update this collection,Flickr authentication failed" while sending images from Lightroom Classic CC. Could you please take a look at the steps mentioned in this article Errors using Publish Services in Lightroom and let us know if that helps?
I have reset the cache in my browser, no change. With solution 1, nothing happens when I right-click the Publish Services plug-in, which seems odd to me.
I have now got Flickr working. Im using a Mac and you have to use Control + click to access the Edit on Publish Services. Reauthorised Flickr and it seems to be working now. Thanks for your help.
Thanks for the update. Glad to know it's working fine now.