Maybe not directly related to this but keep in mind that there is a major issue when accessing Microsoft Planner shared plans using the Microsoft iOS app (https://feedbackportal.microsoft.com/feedback/idea/52d4ad9f-ed24-f011-9d48-000d3a0d77f1) Invited guest users due to all changes are not able to access the plans through any of the iOS apps including Microsoft Planner, Microsoft To Do and Microsoft Team (sub app). It's super frustrating and a massive no-no in modern working environment when working together with 3rd party contractors that use their phone/tablet at on-premise construction locations to fullfill tasks. As a IT MSP I am not able anymore to advise my customers to keep using Microsoft Planner. We keep on seeing fundamental functionality just not working anymore. Also when communicating with Microsoft i keep on noticing that for example Microsoft Planner support team forward me to Microsoft Teams support team because it seems that all apps need to move to Microsoft Teams as a subapp based on the fact missing fundamental functionality as above is just not being added in the exisiting Planner/To Do app. I full understand that they all should be available though one app just make sure it works at least in one of them. My customers are already asking us to migrate to for example Trello.