Last time I check my account is Powerapps of Office 365 Plan E1, which include create + sharing apps .
I shared apps with others user just fine,
However today I see "Working on it" and an error when sharing with a colleagues in my company.
What happened to powerapps?
I have made a test on my side, and don't have the issue that you mentioned. The screenshot as below:
I think this issue is related to an Azure-wide outage in a few services yesterday. The PowerApps support team has been aware of this issue, and are working to restore this capability.
In addition, the Azure team is working to mitigate those issues, which are reflected at https://azure.microsoft.com/status/.
More details about the issue, please check the following article:
Please take a try to share your app again within your PowerApps now, then check if the issue is solved. The Azure service still recovering, please note the updates about this issue process within above link I provided.