Charge Tesla with Ionity

🚧 THIS IS A TICKET MIGRATED FROM UPVOTY. The original ticket and comments will be available for a limited time over at:
https://abrp.upvoty.com/b/report-a-bug/charge-tesla-with-ionity/
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I have a Mercedes Me Card with the possibility to charge at Ionity for 0,29€. Using a Tesla M3, it is not possible to prefer Ionity Chargers. Tesla Superchargers are preferred always, but more expensive.