For that I dont think you need the license.
Keep in mind what you can update with Azure AD B2C
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Company Branding Square Logo not updating in place of the cube in unified Sign In Sign Up page.
I have added 240*240 pixel image as mentioned of size 13 kb.
And Under user flows the setting is as shown below, but when I run the user flow the image is not updated in place of the cube.
Company Branding:
User Flow:
But when running user flow still the same old default square:
How to solve?
For that I dont think you need the license.
Keep in mind what you can update with Azure AD B2C
Do you have any language
specific branding? That would need to be updated as well
I guess the other possibility is licensing and the other pre reqs.
Make sure you meet those:
https://learn.microsoft.com/en-us/entra/fundamentals/how-to-customize-branding#prerequisites