Windows nanoserver github portable (ssh auth) fatal: Could not read from remote repository

General
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3

These parts have been tested and are working in Windows Core Container and on my actual system.

On the Nano based container I place my SSH Keys into C:\AdminScripts\IdentityFiles and in the C:\Users\ContainerUser.ssh\config file I have entries that look like this:

Host github.com-repo1
        Hostname github.com
        User <MyUser>
        IdentityFile=C:\Users\ContainerUser\.ssh\id_ed25519_repo1

I issue the git clone command of

git clone --recursive --depth 1 --no-tags --single-branch --config advice.detachedHead=false --config core.bare=true git@github.com-repo1:<Company>/<repo1>.git C:\AdminScripts\<repo1>

getting the following error back:

Cloning into ‘C:\AdminScripts\repo1’…
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.