GIT credential manager does not seem to jump into action when trying to clone a repository

Version

2.6.0+3c28096588f549cb46f36b552390514356830abe

Operating system

macOS

OS version or distribution

15.1.1 (24B91)

Git hosting provider(s)

GitHub Enterprise Server

Other hosting provider

No response

(Azure DevOps only) What format is your remote URL?

None

Can you access the remote repository directly in the browser?

Yes, I can access the repository

Expected behavior

The Credential Helper should open a login dialog.

Actual behavior

No login dialog is presented. The clone operation fails:

stephan@myMacBookProM2 ShellScripts % git config --global -l                                                                                                
user.name=Stephan Sann
user.email=stephan@sann.name
core.excludesfile=/Users/stephan/.gitignore_global
difftool.sourcetree.cmd=opendiff "$LOCAL" "$REMOTE"
difftool.sourcetree.path=
mergetool.sourcetree.cmd=/Applications/Sourcetree.app/Contents/Resources/opendiff-w.sh "$LOCAL" "$REMOTE" -ancestor "$BASE" -merge "$MERGED"
mergetool.sourcetree.trustexitcode=true
commit.template=/Users/stephan/.stCommitMsg
safe.barerepository=explicit
credential.https://dev.azure.com.usehttppath=true
credential.helper=/usr/local/share/gcm-core/git-credential-manager

stephan@myMacBookProM2 ShellScripts % git clone https://github.adgr.net/IT-Security/PAM.git /Users/stephan/Storage/@SITS/Developer/VRepo/PAM --progress 
Cloning into '/Users/stephan/Storage/@SITS/Developer/VRepo/PAM'...
fatal: unable to update url base from redirection:
  asked for: https://github.adgr.net/IT-Security/PAM.git/info/refs?service=git-upload-pack
   redirect: https://login.microsoftonline.com/98233a1c-af5a-4699-a2c7-9b082989c5a0/saml2?SAMLRequest=jZLdauMw[...]
stephan@myMacBookProM2 ShellScripts %

Logs

No response

Start by reproducing the reported macOS clone command against the GitHub Enterprise Server URL and observe the SAML redirect. Trace how the credential helper handles that redirect, then verify that authentication presents a login dialog and the clone completes successfully.