YES im sure the anonymous user ID exists.

1. workflow setting = on submission – publish post
2. I also have a custom post taxonomy called (locations)
3. redirect user to = Yes, to the single post screen.
4. im also using the shortcode [bbl-create-by-post-type post_type=’post’] in the (create-new-post) page
5. I also have buddyblog pay per post active

This is all the buddyblog code I have I dont think there should be any conflict

 // Request confirmation before post submission.
add_filter( 'bblpro_submission_button_classes', function ( $classes ) {
	array_push( $classes, 'bbl-confirm-action' );

	return $classes;
} );

// Buddyblog minimum words for publishing
add_filter( 'bblpro_validation_errors', function ( $errors, $data ) {

	if ( $errors->has_errors() ) {
		return $errors;
	}
	$content     = empty( $data['bbl_post_content'] ) ? '' : $data['bbl_post_content'];
	$words_count = (int) str_word_count( $content );

	if ( $words_count < 100 ) {
		$errors->add( 'bbl_post_content', _x( 'A minimum of 100 words is required to publish.', 'Post form validation message', 'buddyblog-pro' ) );
	}
	return $errors;
}, 10, 2 );

/**
 * Assign (Sponsored Post) category to BuddyBlog pay per post articles on checkout.
 */
add_action( 'bblpro_ppp_post_published', function( $post_id ) {
	$post_type = get_post_type( $post_id );
	if ( 'post' != $post_type ) {
		return;
	}
	// Get category.
	$newcat = get_term_by( 'name', 'Sponsored posts', 'category' );
	if ( ! $newcat ) {
		return;
	}
	wp_set_post_categories( $post_id, $newcat->term_id, true );
} );

/**
 * Update BuddyBlog Author when a post is submitted in a specific category.
 */
add_filter( 'bblpro_post_submission_prepared_data', function ( $post_data, $form_id, $post, $is_submission ) {
	// update author if the category was selected. Don't do anything on edit.

    $anonymous_cat_id = 1487;
    $anonymous_user_id = 4766806;

    if( ! $is_submission ) {
        return $post_data;
    }

	$selected_terms_ids = isset( $post_data['tax_input'] ) ? (array) $post_data['tax_input'] : array();

	$selected_categories = isset( $selected_terms_ids['category'] ) ? (array) $selected_terms_ids['category']: array();

    if( ! $selected_categories  || ! in_array( $anonymous_cat_id, $selected_categories ) ) {
        return $post_data;
    }

	// Update.
	$post_data['post_author'] = $anonymous_user_id;
	// keep current user data for future?
	if ( ! empty( $post_data['ID'] ) ) {
		update_post_meta( $post_data['ID'], '_bbl_original_post_author', get_current_user_id() );
	}

	return $post_data;
}, 10, 4 );

will be expecting your feed back sir.

thanks

Kind reminder sir

Thanks

I already tested the code but it did not work

Gentle reminder sir

Thanks