Connect-Table-Type MYSQL: access denied when create table

Hello,

I want to use a connect-table between two mariaDB databases.
The target db-server is named host1 and there is a mariaDB db1 with user user1.
The source db-server is named host2 and there is a mariaDB db2 with user user2.
user1 is not in db2 and user2 is not in db1.

When I run the following statement as user1 in db1:

create or replace table test1

 engine = connect

 table_type = MYSQL

 dbname = db2

 tabname = testtab

 connection = 'mysql://user2:password2@host2';

in db1 table test1 is created.

When I run the following statement as user1 in db1:

create or replace table test2

 (column1 int not null,

  column2 varchar)

 engine = connect

 table_type = MYSQL

 dbname = db2

 tabname = testtab

 connection = 'mysql://user2:password2@host2';

I get the error

SQL-Fehler [1045] [28000]: (conn=95) Access denied for user 'user1'@'%' (using password: YES)

Then I create user user1 in db2 on host2 with all privileges and retry creating the conntect-table. But I get always the error

SQL-Fehler [1045] [28000]: (conn=95) Access denied for user 'user1'@'%' (using password: YES)

I don't know, what is wrong. Please help me.

Regards,
Karsten