[#52015] Add information about TOS app in trouble shooting section of… (

#15535)

* [#52015] Add information about TOS app in trouble shooting section of Nextcloud app  https://community.openproject.org/work_packages/52015

[#52015] Add information about TOS app in trouble shooting section of Nextcloud app

https://community.openproject.org/work_packages/52015

* Update docs/system-admin-guide/integrations/nextcloud/README.md

Co-authored-by: dominic-braeunlein <d.braeunlein@openproject.com>

* Update docs/system-admin-guide/integrations/nextcloud/README.md

Co-authored-by: dominic-braeunlein <d.braeunlein@openproject.com>

* Update docs/system-admin-guide/integrations/nextcloud/README.md

Co-authored-by: dominic-braeunlein <d.braeunlein@openproject.com>

---------

Co-authored-by: dominic-braeunlein <d.braeunlein@openproject.com>

docs/system-admin-guide/integrations/nextcloud/README.md

@@ -70,7 +70,9 @@ In the configuration page that appears, you'll see a blank text field titled **O
 
 Click on the **Save** button. 
 
-> **Note:** If the OpenProject host cannot be added, you may check the [Troubleshooting](#troubleshooting) section at the bottom of this page
+> **Note:** If the OpenProject host cannot be added, you may check the [Troubleshooting](#troubleshooting) section at the bottom of this page.
+
+Please note, when you use the **Terms of Service** app on the Nextcloud side, all terms also need to be accepted for the OpenProject user that gets created during the setup. This is set to happen automatically during the initial set-up. If you see an error message indicating otherwise or the integration does not behave as expected, please refer to the [Troubleshooting](#troubleshooting) section at the bottom of this page.
 
 The next part of the setup will require you to enter OpenProject OAuth values here, but before we do that, you will need to generate them in OpenProject. To do so, navigate to your OpenProject instance in a new browser tab. 
 
@@ -226,6 +228,14 @@ Some administrators setup OpenProject using a self signed TLS/SSL certificate wi
 
 Attention: Please do not confuse the CA for the Nextcloud server's certificate with the CA of the OpenProject server's certificate which you might have provided in the OpenProject installation wizard. They do not necessarily need to be the same.
 
+#### Error message "Sign terms of services"
+
+**Terms of services** is an app on the Nextcloud side of integration that makes it mandatory for users to accept terms of services before Nextcloud can be used. In order for the integration to work properly the OpenProject user also needs to accept all terms that are set up. It should be accepted automatically during the set up process. However, it is possible that in certain situations it does not happen automatically. 
+
+
+To fix this please log into Nextcloud, proceed to Administration and select OpenProject. This will trigger an automatic background check and suggest that *Terms of services* be signed. 
+![Fix a Terms of services error in Nextcloud](openproject_system_guide_tos_fix.png)
+
 #### While setting up Project folders
 
 While setting up the project folders we create a new user, group and group folder named `OpenProject`. At the time of set up the system expects either all of these entities to have been set up with proper permissions or none of them to be present. If one or more of these entities are present without required permissions, an error message will be displayed.