Confluence cloud migration does not work in IE11

Issue Summary

Confluence cloud migration does not work in IE11

Steps to Reproduce

I've used an external non-atlassian account and I was not logged in in the browser before I started migration

1. Use IE 11 browser
2. Start Confluence cloud migration
3. Get to "Connect to your cloud site" page
4. Hit "Choose cloud site button"
5. Login to the account and select the site

Expected Results

Your migration site is selected and you can proceed with the migration

Actual Results

Migration site is not selected. You are redirected back to the "Connect your cloud site" page which offers you to select the site again. You can't proceed further

See attached video.

Workaround

Use another browser