MySQL trigger locks table [closed]

Question

I have created trigger in MySQL to update data but problem is as soon as I deploy trigger, it's locking tables and applications using these tables are not able to access.

Edit

Trigger I have created will insert data in a table

USE app ; //db user n database1
DELIMITER $
Create trigger Insert_Data After insert on clients for each row
Begin

insert into database2.customers` 
values('1', NULL, NULL, NULL, 'US', 'USD', NULL, NULL, NULL, NULL, NULL, 'America/New_York', NULL, '0', '0', NULL
);

End $
DELIMITER ;

Once above trigger deployed, clients table is not accessible by a website/GUI that inserts data from a submit option on UI page.

Edit

I am adding the SQLError logs, Also apologise for not mentioning I am inserting data in another database using the trigger in one database.

production.ERROR: [stacktrace] 2022-02-25 05:54:43 SQLSTATE[42000]: Syntax error or access violation: 1142 INSERT command denied to user XXXXX

What can I do for this case where trigger should add record in database2 when executed from database1?