Comment (by William Gabella):

Okay the “host password” using my userid and not my SSO email, worked today. Maybe something was buggered yesterday evening or this is the magic incantation. Curl command was

curl -u 'wegabella' -X POST https://api.bitbucket.org/2.0/repositories/einsteintoolkit/www/downloads -F files=@"poisson_20201119.tar.gz"
Enter host password for user 'wegabella':

And I used the “app password” made with my Bitbucket, SSO account with full email “b.gabella@vanderbilt.edu” and selecting all permissions…maybe too much.

In “Your profile and settings” > Personal Settings> App Passwords. Create one and in this case because of the difficulty I had I selected all permissions. It warns you but, you cannot look at the password after the one time it shows it to you, so copy it down.

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2173/test-poisson-equation-example