We are strongly disagree for this action, as our company is very rely the Groups Calendar for our daily schedule on Groups mobile apps!
For example: apply staff leaves, arrange sales appointments, arrange marketing meeting, arrange design schedule, etc.
So, access the Groups Calendar on mobile apps is most important for us.
But this moment, no way to access Groups Calendar on mobile Outlook apps, SharePoint apps or other mobile apps.
Please suggest another solution to access the Groups Calendar on mobile apps intends.
Or please update the Outlook mobile apps with Groups Calendar ASAP.
One more things, this Outlook Groups apps is the most easier way to access the Groups Conversation, Groups Files, Groups Calendar, Groups Notebook on one apps. If separate it, the core value of the Groups will be gone.