Why can’t I send or create invoices on my phone anymore

I understand that you are concerned about creating an invoice and accessing the customer tab in your mobile app, @mike-jmj. I would like to provide some insight into why this might be happening.

The QuickBooks system may occasionally display unusual behavior as a result of synchronization or latency issues. To troubleshoot these errors, clearing the application's data can be an effective solution. Here are the steps to take:

For iOS:
 

1. In Settings, click General.
2. From the iPhone Storage, select QuickBooks Online app. 
3. If done, choose Offload App. 

For Android:

1. From Menu, tap More options ⋮.
2. Hit Settings and Refresh Data. 
3. After that, select Yes to confirm. 

Furthermore, I recommend checking out this article to understand the features supported by each device in QuickBooks Online: Compare mobile app features.

We're only a click away if you need further assistance with creating an invoice or have any questions related to QuickBooks. You can always comment below or visit us here in the Community space. Keep safe.