Problem

After your repository is moved from https://github.com/Deltares to the new organization https://github.com/Deltares-research, it is possible that you are required to re-authorize the OAuth Application when you perform a GIT action on the command line.

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Solution

Follow the following steps to refresh you authorization token:

1. Open the Credential Manager in Widows. (Image Modified type 'Credential Manager')
2. In Credential Manager select 'Windows Credentials'
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3. Lookup the credentials for git:https://github.com and remove this.
4. Re-initialise the cred manager in git bash: git config --global credential.helper manager-core
5. Re-run git pull and follow the pop-up instructions to authenticate in a browser (which happened automatically for me with SSO).