It would be great to use mattermost as identity provider for applications that support OpenID Connect

Some sort of cheklist so team members can track the progression of tasks

When clicking on "Send IM" in Outlook, it always opens Zoom Chat instead of MatterMost, because Zoom has an Outlook plug in for Outlook chat, but MatterMost does not.

The only Outlook plug in available on the MatterMost website is to forward emails. We desperately need a native MatterMost Outlook integration to make MatterMost the default chat/IM application when clicking that button in Outlook.

We are using a e-mail-based ticket system (e.g., ticketsupport@company-name.org). As most of our communication switched to Mattermost, the only remainder is writing mails to create a ticket.
Therefore, it would be really convenient to send a e-mail using something like:
/[mail-address] ["Subject"] ["Body"]
The from address is the address used by Mattermost.

Support all issue status update event transitions, not just only status changes when the ticket is reopened, or when resolved/closed, and assignee changes.

We use the issue status transition to trigger the QA Team to start work. Would be nice to have these notifications via the Mattermost Integration

Tool from Adobe, such as Xd, Connect and Acrobat should have an integration to allow the sharing of documents.

Be able to automatically send looker data to channels via a bot

Miro (https://miro.com/) is a collaborative whiteboarding system popular with (interaction) designers but also used in research and strategy planning.

Microsoft Teams allows the following events from Miro to be shown:

• invitees sign up
• board is shared with you
• there's a new comment or a reply to your comment on a board
• someone @mentions you in a comment or reply.

Source: https://help.miro.com/hc/en-us/articles/360017572514-Microsoft-Teams

It would be nice to have a similar integration in Mattermost.

A daily checklist that appears every day with tasks that have to be completed and can be worked through together

Need to integrate mattermost with ERP Odoo 10 and onward versions

Meistertask and Mindmeister

InVision integration with Mattermost

Add Mumble/Murmur voice integration.

Murmur is the server component of Mumble, and is lightweight, with highly configurable options and good encryption and voice quality. I think it could really be a powerful voice integration to consider, as it has an easier to use interface than say, Jitsi. Voice inside mattermost would make it a Discord killer imho.

Comments with specific hashtags will be sent to specified channels.
Example: #Outage could be sent to a general user notification channel as well as an administrators channel.
Example: A reference to a specific program release in a developer chat could be sent to to a project-specific QA chat.

While the desktop and browser interface have integrations buttons in the top right corner (Zoom / Jitsi), this is not available for the Android/iOS versions.
While / commands work (/jitsi) it is not intuitive for new users.

Suggestion is to allow adding a icon next to the / icon in the interface.

Add user description in account settings so, you can learn more about the other user.

Collaborative apps would greatly benefit from reusing a robust and mature chat system, instead of reimplementing a shitty one (think Google Meet's side chat). It would be great if Mattermost could allow an existing channel (or a newly-created one) to be embedded inside an iframe that communicates with the host window e.g. via postMessage or similar mechanism.

Develop integrations with educational platforms like Blackboard

It would be great to push notes from Mattermost into productboard to influence future product discovery.

There are other open-source kanban applications besides Trello. I'd like it if there were other integrations.