Cannot delete share

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Found a solution for my Problem.
I was looking in the database, and found the table, which i simlpy truncated.

MariaDB [nextcloud]> SELECT * FROM oc_share_external;
+----+--------------------------------------+-----------+-----------------+----------+-----------------------------+--------+--------+-----------------------------+----------------------------------+----------+--------+------------+
| id | remote                               | remote_id | share_token     | password | name                        | owner  | user   | mountpoint                  | mountpoint_hash                  | accepted | parent | share_type |
+----+--------------------------------------+-----------+-----------------+----------+-----------------------------+--------+--------+-----------------------------+----------------------------------+----------+--------+------------+
|  2 | https://rocinante.fritz.box:42022/   | 32        | aaasssddd       |          | /Dummyfolder Nextcloud-home | tuffi  | tuffi  | /Dummyfolder Nextcloud-home | kkkkkkkkkkkkkkkkkkkk             |        1 |     -1 |          0 |
|  4 | https://xxx.your-storageshare.de/    | 90        | dddddsssaaa     |          | /Ayreon                     | cl     | tuffi  | /Freigaben/Ayreon           | kkkkkkkkkkkkkkkkkkkk             |        1 |     -1 |          0 |
+----+--------------------------------------+-----------+-----------------+----------+-----------------------------+--------+--------+-----------------------------+----------------------------------+----------+--------+------------+
2 rows in set (0,000 sec)

TRUNCATE oc_share_external;

That was doing the trick for me.

Edit:
Here you can find a more detailed instruction: