diff --git a/files/converter/googledrive/classes/converter.php b/files/converter/googledrive/classes/converter.php
index 831c20f31d8..db189e61ba8 100644
--- a/files/converter/googledrive/classes/converter.php
+++ b/files/converter/googledrive/classes/converter.php
@@ -234,6 +234,10 @@ class converter implements \core_files\converter_interface {
             return false;
         }
 
+        if (!$issuer->get('enabled')) {
+            return false;
+        }
+
         if (!$issuer->is_system_account_connected()) {
             return false;
         }
diff --git a/files/converter/googledrive/lang/en/fileconverter_googledrive.php b/files/converter/googledrive/lang/en/fileconverter_googledrive.php
index f118f0ef711..b99ed87428b 100644
--- a/files/converter/googledrive/lang/en/fileconverter_googledrive.php
+++ b/files/converter/googledrive/lang/en/fileconverter_googledrive.php
@@ -32,3 +32,7 @@ $string['test_converter'] = 'Test this converter is working properly.';
 $string['test_conversion'] = 'Test document conversion';
 $string['test_conversionready'] = 'This document converter is configured properly.';
 $string['test_conversionnotready'] = 'This document converter is not configured properly.';
+$string['test_issuerinvalid'] = 'The OAuth service in the document converter settings is set to an invalid value.';
+$string['test_issuernotenabled'] = 'The OAuth service set in the document converter settings is not enabled.';
+$string['test_issuernotconnected'] = 'The OAuth service set in the document converter settings does not have a system account connected.';
+$string['test_issuernotset'] = 'The OAuth service needs to be set in the document converter settings.';
diff --git a/files/converter/googledrive/test.php b/files/converter/googledrive/test.php
index fa764caad90..d090db182a0 100644
--- a/files/converter/googledrive/test.php
+++ b/files/converter/googledrive/test.php
@@ -57,7 +57,36 @@ if ($result) {
     $msg .= html_writer::link($pdflink, get_string('test_conversion', 'fileconverter_googledrive'));
     $msg .= html_writer::empty_tag('br');
 } else {
-    $msg = $OUTPUT->notification(get_string('test_conversionnotready', 'fileconverter_googledrive'), 'warning');
+
+    // Diagnostics time.
+    $issuerid = get_config('fileconverter_googledrive', 'issuerid');
+    $msg = '';
+    if (empty($issuerid)) {
+        $msg = $OUTPUT->notification(get_string('test_issuernotset', 'fileconverter_googledrive'), 'warning');
+    }
+
+    if (empty($msg)) {
+        $issuer = \core\oauth2\api::get_issuer($issuerid);
+        if (empty($issuer)) {
+            $msg = $OUTPUT->notification(get_string('test_issuerinvalid', 'fileconverter_googledrive'), 'warning');
+        }
+    }
+
+    if (empty($msg)) {
+        if (!$issuer->get('enabled')) {
+            $msg = $OUTPUT->notification(get_string('test_issuernotenabled', 'fileconverter_googledrive'), 'warning');
+        }
+    }
+
+    if (empty($msg)) {
+        if (!$issuer->is_system_account_connected()) {
+            $msg = $OUTPUT->notification(get_string('test_issuernotconnected', 'fileconverter_googledrive'), 'warning');
+        }
+    }
+
+    if (empty($msg)) {
+        $msg = $OUTPUT->notification(get_string('test_conversionnotready', 'fileconverter_googledrive'), 'warning');
+    }
 }
 $returl = new moodle_url('/admin/settings.php', array('section' => 'fileconvertergoogledrive'));
 $msg .= $OUTPUT->continue_button($returl);
diff --git a/lib/classes/oauth2/issuer.php b/lib/classes/oauth2/issuer.php
index e58b07c1b89..7960ea654d1 100644
--- a/lib/classes/oauth2/issuer.php
+++ b/lib/classes/oauth2/issuer.php
@@ -180,9 +180,25 @@ class issuer extends persistent {
             return false;
         }
         $sys = system_account::get_record(['issuerid' => $this->get('id')]);
-        if (!empty($sys) and !empty($sys->get('refreshtoken'))) {
-            return true;
+        if (empty($sys) || empty($sys->get('refreshtoken'))) {
+            return false;
         }
-        return false;
+
+        $scopes = api::get_system_scopes_for_issuer($this);
+
+        $grantedscopes = $sys->get('grantedscopes');
+
+        $scopes = explode(' ', $scopes);
+
+        foreach ($scopes as $scope) {
+            if (!empty($scope)) {
+                if (strpos(' ' . $grantedscopes . ' ', ' ' . $scope . ' ') === false) {
+                    // We have not been granted all the scopes that are required.
+                    return false;
+                }
+            }
+        }
+
+        return true;
     }
 }