overlay Menu under avatar is empty on "use TYPO3 Slack" page

Summary

Overlay menu under avatar is empty on "use TYPO3 Slack" page

Steps to reproduce

log in on my.tupo3.org go to https://my.typo3.org/my-profile/use-typo3-slack click on avatar

The same issue exists after going to https://my.typo3.org/my-profile/edit-your-profile and submitting changes. You'll see green flash message,and if you click on avatar, overlay will be empty.

What is the current bug behavior?

orange overlay is empty. The console log show 404 on ajax request https://my.typo3.org/index.php?type=4444&returnUrl=https://my.typo3.org/my-profile/use-typo3-slack?tx_t3oslack_pi1%5Baction%5D=connect&tx_t3oslack_pi1%5Bcontroller%5D=SlackUser&cHash=fa59977df46fea4ec5d9f7b046a9f2c9

What is the expected correct behavior?

there should be something in the overlay e.g. "Hello Your Name"

Relevant logs and/or screenshots