Okay , now I have done some changes for you .
Please follow the given steps:
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Open the MailboxService file, path of this file is given here :
-> project-name\vendor\uvdesk\mailbox-component\Services\MailboxService.php -
Open the Updated MailboxService file from here.
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Take a backup of your project MailboxService file first.
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Now copy the whole code from github Updated MailboxService file & past it in your project Mailbox service file .
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run the SSH command: php bin/console c:c & after that run the Mailbox refresh command.
I hope this time it will work for you , If not please let me know