Unity Issue Tracker - [USABILITY] Custom Package incorrect name error is not informative when the name has an uppercase letter

Duplicate

Duplicate in 6000.6.X

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Issue ID

Regression

[USABILITY] Custom Package incorrect name error is not informative when the name has an uppercase letter

-

Apr 10, 2026

Steps to reproduce:

Create a new Unity project using the Universal 3D template
Open the Package Manager window (Window > Package Management > Package Manager)
Create a custom package named "asd" by pressing the "+" button in the Package Manager window
Select the "asd" package in the Package Manager
Click the "Edit" button in the Inspector window
Change the "Name" field to "Asd"
Observe the error in the Inspector window

Actual results: Invalid Package Name 'asd'

Expected results: The error should tell the user specifically what is wrong with the name, for example that the user cannot use uppercase letters

Reproducible with versions: 6000.3.13f1, 6000.4.3f1, 6000.5.0b4, 6000.6.0a2

Can’t test with versions: 6000.0.73f1 (due to no custom package functionality)

Tested on (OS): MacOS Silicon Tahoe 26.3, Ubuntu 24.04