php error check shows this as well:
FILE: ………public_html/wp-content/plugins/oauth2-provider/library/WPOAuth2/Request.php
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FOUND 4 ERRORS AFFECTING 4 LINES
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101 | ERROR | Global variable ‘$HTTP_RAW_POST_DATA’ is deprecated since PHP 5.6 and removed since PHP 7.0; Use php://input instead
104 | ERROR | Global variable ‘$HTTP_RAW_POST_DATA’ is deprecated since PHP 5.6 and removed since PHP 7.0; Use php://input instead
109 | ERROR | Global variable ‘$HTTP_RAW_POST_DATA’ is deprecated since PHP 5.6 and removed since PHP 7.0; Use php://input instead
112 | ERROR | Global variable ‘$HTTP_RAW_POST_DATA’ is deprecated since PHP 5.6 and removed since PHP 7.0; Use php://input instead
