Have you run into the problem with apps (plug-ins or add-ins) showing up in separate ribbon tabs? AutoCAD, AutoCAD Architecture, AutoCAD Civil 3D, AutoCAD Electrical, AutoCAD MEP, AutoCAD Map 3D, AutoCAD Mechanical, AutoCAD P&ID, AutoCAD Plant 3D and possibly other AutoCAD verticals have this problem.
I noticed this problem in also AutoCAD Architecture 2018. Note even the updates have fixed this.
Steps to solve this were found here.
(Note that Steps 2-4 are not necessary for 2015 and newer, though you may just want to check that the alias is there.)
1. Open the Customize User Interface (CUI) dialogue box by typing the CUI command (or choose Customize from the Workspace drop down list)
2. Under Customizations in All Files, and All Customization Files, expand Ribbon > Tabs and select Add-Ins
3. Under Properties > Advanced, click on the [...] that appears next to Aliases
4. Type ID_ADDINSTAB in the Aliases dialogue box, then click OK
5. Under Customizations in All Files, expand Workspaces and select [Your Workspace]
6. Under Workspace Contents, click on Customize Workspace (the Workspace Contents values should turn blue)
7. Under Customizations in All Files, scroll down and check the box next to "Add-Ins" (under Ribbon > Tabs)
8. Under Workspace Contents, click Done
9. Under Customizations in All Files, expand Partial Customization Files
10. Right-click each plug-in .CUIX that you have and choose "Unload..." (examples of plug-ins are: SKETCHUPIMPORTSKP, CHRONICLE, APPMANAGER
11. Click OK at the bottom of the CUI dialogue box
12. Make sure to select Add-ins from the left pane and change Show to Yes
13. Restart AutoCAD
Much better:
