MyParcel module cannot work with multiple API keys (Multistore)

[YoranWattimena]

Plugin version

4.10.0

Magento version

2.4.3

PHP version

7.4

What went wrong?

Conclusion: When using the MyParcel module you cannot use multistore (multiple API Keys for different stores). Mainstore works fine and prints labels. The substores do not print labels and orders are set on "Concept" (when using the same steps as the mainstore to print labels).

Reproduction steps

1. Navigate to an order in your substore
2. Click on print shipping label
3. Then the label does not print or get sent to myparcel and stays on concept

Relevant log output

No response

Additional context

Issue has been further explained (intern) to MyParcel developer Joeri.