Strict-origin-when-cross-origin

I have a WordPress website with multilingual (Polylan WP plugin). And these are on separate subdomain. eg.
https://de.main_domain.nl/ and https://en.main_domain.nl/.

https://de.main_domain.nl/ is default site (Primary language). I pointed https://en.main_domain.nl/ same as https://de.main_domain.nl/. And site is working fine. But, there are showing “strict-origin-when-cross-origin” with 403 when I try to submit a ajax form from https://en.main_domain.nl/.

Note: I am trying submit form from https://en.main_domain.nl/ .

Request URL:
https://de.main_domain.nl/?wjbp-ajax=wp_job_board_pro_ajax_apply_email

Request Method:
POST

Status Code:
403 Forbidden

Referrer Policy:
strict-origin-when-cross-origin

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