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Dear developers,
there is an issue currently with creating a consent and calling availableAccounts with the value allAccountsWithOwnerName. For the decoupled flow, a 400 Bad Request error message will be delivered. For the redirect flow, an error message prdctNtPsd2Rlvnt will be delivered, indicating that the product is not PSD2 relevant.
Currently, as a workaround, you can use the call allPsd2 with the value allAccountsWithOwnerNam in both cases - decoupled as well as redirect. Please see an example request below: 
{
    "access":{
        "allPsd2": "allAccountsWithOwnerName"
    },
    "recurringIndicator": true,
    "frequencyPerDay": 4,
    "combinedServiceIndicator": false,
    "validUntil": "2023-06-20"
}
We are working on a fix with high priority and will inform you once it's solved.
Thank you for your understanding and we apologize for the inconvenience.
Your Commerzbank Support-Team