On October 7, we released Android app version 19.10.10. An issue on that version caused Slack to become inaccessible for members of organizations with Secondary Authentication enabled.
On October 11, we identified the cause, and on October 12, we released an app update to version 19.10.11 that fixed the problem with Secondary Authentication.
3:13 AM PST
For those affected, we're happy to report you should be able to sign in on Android devices. We're sorry for the trouble, and we appreciate your patience. Please let us know at email@example.com if we can be of any help.
1:42 PM PST
Some customers may be unable to sign in to Slack on Android devices, due to erroneous prompts indicating that a secondary authentication method is needed. Our team is on the case, and will report back once we have more news to share. We apologize for the added trouble in the meantime.
11:32 AM PST