Repro Steps:
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1. Login in CRM 2016 SP1 Organization from the Web.
2. Click on Setting > Customization > Customize the System
3. It will open the default solution of CRM organization. Expand Entities node and search for Contact Entity.
4. Select the Contact entity and expand the node.
5. Click on charts. Click on New button to create a new chart.
6. In the dropdown of "View used for Chart Preview", select any view. Lets say for example select "Active Contacts" (Please create 20 Contacts records for testing purpose ). Enter the name of the Chart - "test chart".
7. In Legend Entries (Series) Select the "Status" in drop down and select "Count: All" value in the second drop down.
8. Under Horizontal (Category) Axis Labels, select "Contact Name" value in the drop down. From the ribbon click on "Save and Close" button.
9. Click on "Publish All Customizations" from the command bar of the Default Solution window.
10. In the Default Solution window, from left pane, click on "Dashboard".
11. Click on New button and select "Dashboard" to create a new dashboard.
12. Select 3 Column Regular Dashboard and click on Create to create a new dashboard
13. Select a Component and click on "Chart" from the ribbon in that component.
14. A window will open to Add components.

Record Type : Contact
View : Active Contacts
Chart: Test chart (Select the chart that we have created: Test chart )

13. Click on Add. Enter the name of the Dashboard, lets say "New Dashboard". Click on Save.
14. Click on properties from the command bar and click on check box "enable for mobile". Click on OK. Close the Dashboard.
15. Click on Publish All Customizations.
16. We navigate to Sales and click on Dashboard.
17. We are able to successfully view the labels on the X-Axis of the chart in the dashboard in the CRM Web.
18. Configure CRM organization in Dynamics 365 app in Windows 10 machine.
19. In Dynamics 365 app, Click on Navigation and Select Dashboards. Load the dashboard "New Dashboard" and we see that we are not able to view the labels on the X-Axis of the chart in the dashboard on the tablet view.
20. We have observed that issue happens only if we increase the no of contact records to more than 15 then we are not able to view the labels in the X axis of the dashboard in CRM 2016 of tablet version.

Customer Impact:

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For growing business we would need to complex charts to understand the business requirement.
The X-axis of the charts is essential to get the detailed of the Charts.