LDAP User Profile Mail address desappear

Steps to reproduce

1.Configure LDAP
2. Log in as user
3.Fill the mail address on user profile
4. OC shows msg mail alteration sucess
5. Passed few mins came back to profile and te mail address is blank

Expected behaviour

The mail should stick

Actual behaviour

Tell us what happens instead

Server configuration

Operating system:
Ubuntu 16.04
Web server:
Apache 2
Database:
Mysql 5
PHP version:
7
ownCloud version: (see ownCloud admin page)
10.0.0.8 stable
Updated from an older ownCloud or fresh install:
fresh install
Where did you install ownCloud from:
repository
Signing status (ownCloud 9.0 and above):

Login as admin user into your ownCloud and access 
http://example.com/index.php/settings/integrity/failed 
paste the results into https://gist.github.com/ and puth the link here.
No errors have been found.


**The content of config/config.php:**

Log in to the web-UI with an administrator account and click on
‘admin’ -> ‘Generate Config Report’ -> ‘Download ownCloud config report’
This report includes the config.php settings, the list of activated apps
and other details in a well sanitized form.

or

If you have access to your command line run e.g.:
sudo -u www-data php occ config:list system
from within your ownCloud installation folder

ATTENTION: Do not post your config.php file in public as is. Please use one of the above
methods whenever possible. Both, the generated reports from the web-ui and from occ config:list
consistently remove sensitive data. You still may want to review the report before sending.
If done manually then it is critical for your own privacy to dilligently
remove all host names, passwords, usernames, salts and other credentials before posting.
You should assume that attackers find such information and will use them against your systems.


**List of activated apps:**

If you have access to your command line run e.g.:
sudo -u www-data php occ app:list
from within your ownCloud installation folder.


**Are you using external storage, if yes which one:** local/smb/sftp/...

**Are you using encryption:** yes/no

**Are you using an external user-backend, if yes which one:** LDAP/ActiveDirectory/Webdav/...

#### LDAP configuration (delete this part if not used)

With access to your command line run e.g.:
sudo -u www-data php occ ldap:show-config
from within your ownCloud installation folder

Without access to your command line download the data/owncloud.db to your local
computer or access your SQL server remotely and run the select query:
SELECT * FROM oc_appconfig WHERE appid = ‘user_ldap’;

Eventually replace sensitive data as the name/IP-address of your LDAP server or groups.


### Client configuration
**Browser:**

**Operating system:**

### Logs
#### Web server error log

Insert your webserver log here


#### ownCloud log (data/owncloud.log)

Insert your ownCloud log here


#### Browser log

Insert your browser log here, this could for example include:

a) The javascript console log
b) The network log
c) …

Can you enter the e-mail address in your LDAP instead of of ownCloud and see if it persists?

I suppose you meant 10.0.8

Could you provide your LDAP configuration, please?