As of October 1st, 2019 we removed all Yammer functionality from Process Street.
After this time, you will need to log-in using an email and password instead of Yammer. This will not affect your Process Street data in any way. Updates will no longer be posted to Yammer Groups.
At Process Street, we strive to develop integrations that are useful to most of our customers. We have seen a decline in Yammer usage and have decided to sunset this integration in order to focus on providing you with the most value.