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Justing adding: After experimenting with some caching plugins like WP-Rocket I got new problems with the WC API V3. After deactivating WP-Rocket it worked again. Could be a source of error as well.

I run into the same issue after I had changed the server. I got a 401 response with the v3 API.

After changing the .htaccess like Mike proposed the problem was solved.

Only line changed:

RewriteRule ^index\.php$ – [E=HTTP_AUTHORIZATION:%{HTTP:Authorization},L]

If you select transparent header + hide page title then there is still a 40px padding-top and padding-bottom which comes from the wpbf-padding-medium selector.

to remove the padding, just add this to your style.css

.wpbf-padding-medium {
padding-top: 0px;
padding-bottom: 0px;
}

done.

I am not using any plugin but the standard bootstrap js built in Bootstrap3.

To exclude any css or js error I made a fresh clean WP installation with the SparklingTheme and added the standard bootstrap modal html markup from here https://www.w3schools.com/bootstrap/bootstrap_modal.asp

The WP Test site: https://sparklingtest.dev2.space/modal-test/

You can see that the modal is disappearing behind a black screen. An error which not occurred which Sparkling version 2.3.2.

Problem solved. It was a RECAPTCHA field what caused the error.

I deacted this plugin but the error persist. the job_submit.php with is called with the form submit button delivers a white page.