Having trouble configuring G-Node GIN with SSH

I created an SSH key and added it to my G-Node GIN user settings, but for some reason I can't push to it from the UPenn HPC.

Steps to reproduce:

dataset_id="ds002156"
base_dir="/cbica/home/salot/open-multi-echo-data/datasets"
superdataset_dir=${base_dir}/${dataset_id}_test
raw_dataset_dir=${superdataset_dir}/inputs/data
code_dir="/cbica/home/salot/open-multi-echo-data/code/code"

# Create the YODA superdataset
datalad create -c yoda \
    -D "Create superdataset for OpenNeuro dataset ${dataset_id}" \
    "${superdataset_dir}"

cd ../../datasets/ds002156_test/

# Clone the dataset
datalad clone -d ${superdataset_dir} \
    -D "Clone of OpenNeuro dataset. May be modified for fMRIPrep/AFNI and pushed to G-Node GIN." \
    https://github.com/ME-ICA/${dataset_id}.git ${raw_dataset_dir}

# Download the files
cd ${raw_dataset_dir}
datalad get ${raw_dataset_dir}

# Create the GIN repo (this works)
datalad create-sibling-gin \
    --access-protocol ssh \
    --dataset ${raw_dataset_dir} \
    --credential GIN \
    ME-ICA/${dataset_id}_raw

# Try to push the data to GIN
datalad push -d ${raw_dataset_dir} --to gin

This gets me the following error:

Push to 'gin':  25%|██████████████████████████████▎                                                                                          | 1.00/4.00 [00:00<00:00, 6.29k Steps/s]ssh_exchange_identification: Connection closed by remote host
Update availability for 'gin':  75%|██████████████████████████████████████████████████████████████████████████████▊                          | 3.00/4.00 [00:00<00:00, 5.12k Steps/s]CommandError: 'git -c diff.ignoreSubmodules=none -c core.quotepath=false fetch gin git-annex' failed with exitcode 128
ssh_exchange_identification: Connection closed by remote host
ConnectionOpenFailedError: 'ssh -fN -o ControlMaster=auto -o ControlPersist=15m -o ControlPath=/cbica/home/salot/.cache/datalad/sockets/... git@gin.g-node.org' failed with exitcode 255 [Failed to open SSH connection (could not start ControlMaster process)]
fatal: Could not read from remote repository.

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

Start by rerunning the documented DataLad setup and push commands on the UPenn HPC, then inspect the SSH and DataLad connection output around gin.g-node.org. Compare the configured GIN repository and SSH access with the failing ControlMaster connection. Done means the dataset can push to the GIN sibling successfully without the connection error.