You could try to check if you have followed these steps to set up and launch Viva Connections in your mobile device:
1)Prepare intranet navigation design and content
2)Designate a home site in SharePoint
3)Enable the SharePoint app bar and customize global navigation
4)Create your Dashboard, add cards, and apply audience targeting in SharePoint
5)Get content ready for your Feed with SharePoint news and Yammer
6)Enable the Viva Connections app in the Microsoft Teams admin center
7)Choose settings for your mobile Viva Connections app
8)Let your users know how to access and use Viva Connections
For more details about each steps description, please refer to this article.
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