When I visit feedback.clickup.com on my desktop I'm able to post automatically. When I visit with my Android, Canny required me to create a Canny account and sign in.

Interestingly, when I created an account with the same email I use for ClickUp, once I was signed in, Canny recognized all the postings I had previously up-voted. So perhaps Canny just needs a screen that suggests the Android user sign in with their ClickUp credentials.