Favicon branding is disabled
Branding upload returned 403 Favicon branding is disabled. when favicon uploads are not allowed for this account/features.
Why this happens
Tier/settings allow some branding but not favicon specifically. Broader block: Branding is not available for this account.
Diagnose and fix
1. Admin: enable favicon under user branding features for the tier.
2. Member: upload logo/social assets if those remain enabled.
3. See User branding logo, favicon, and social.
4. See Which tiers may use user branding.