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Sorry to hear you’re facing problems 
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In order to help you as quickly as possible, before clicking Create Topic please provide as much of the below as you can. Feel free to use a pastebin service for logs, otherwise either indent short log examples with four spaces:
example
Or for longer, use three backticks above and below the code snippet:
longer
example
here
Some or all of the below information will be requested if it isn’t supplied; for fastest response please provide as much as you can 
Nextcloud version 14:
Operating system and version Windows 10:
Apache or nginx version (eg, Apache 2.4.25):
PHP version 4.7.7:
The issue you are facing:
I try to connect with desktop client. It says “Access Forbidden by server. To verify that you have…”
I have tried using the app password from Nextcloud settings. Same result. I have added my current public IP address to trusted domains. I have tried creating a new using and doing that. I have tried “click here to access the service with your browser.” I can access it just fine in the browser. I also get a login error with the android app.
Is this the first time you’ve seen this error? Yes, but this is also the initial setup:
Steps to replicate it:
- NextCloud Connection Wizard
- use my HTTPS URL to access Nextcloud
- Type in my Login information
The output of your Nextcloud log in Admin > Logging:
{"reqId":"W@GqXEB9UM6XAXwemrM5gQAAAAA","level":3,"time":"2018-11-06T14:51:09+00:00","remoteAddr":"5.162.211.207","user":"--","app":"cron","method":"GET","url":"\/nextcloud\/cron.php","message":{"Exception":"Error","Message":"Call to undefined method OCP\\AppFramework\\Http\\DataResponse::succeeded()","Code":0,"Trace":[{"file":"\/home\/peakunit\/public_html\/nextcloud\/lib\/private\/BackgroundJob\/Job.php","line":61,"function":"run","class":"OCA\\Survey_Client\\BackgroundJobs\\MonthlyReport","type":"->","args":[null]},{"file":"\/home\/peakunit\/public_html\/nextcloud\/lib\/private\/BackgroundJob\/TimedJob.php","line":55,"function":"execute","class":"OC\\BackgroundJob\\Job","type":"->","args":[{"__class__":"OC\\BackgroundJob\\JobList"},{"__class__":"OC\\Log"}]},{"file":"\/home\/peakunit\/public_html\/nextcloud\/cron.php","line":146,"function":"execute","class":"OC\\BackgroundJob\\TimedJob","type":"->","args":[{"__class__":"OC\\BackgroundJob\\JobList"},{"__class__":"OC\\Log"}]}],"File":"\/home\/peakunit\/public_html\/nextcloud\/apps\/survey_client\/lib\/BackgroundJobs\/MonthlyReport.php","Line":43,"CustomMessage":"--"},"userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64; rv:63.0) Gecko\/20100101 Firefox\/63.0","version":"14.0.3.0"}
{"reqId":"W@Gq53uhZFgLX0bpFyYxawAAACE","level":2,"time":"2018-11-06T14:53:27+00:00","remoteAddr":"5.162.211.207","user":"--","app":"core","method":"POST","url":"\/nextcloud\/index.php\/login?redirect_url=\/nextcloud\/index.php\/settings\/user\/security","message":"Login failed: 'admin' (Remote IP: '5.162.211.207')","userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64; rv:63.0) Gecko\/20100101 Firefox\/63.0","version":"14.0.3.0"}
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
<?php
$CONFIG = array (
'instanceid' => 'oco9wd8dwwdw',
'passwordsalt' => 'e4qQO+UBW9LKt9R5VKMFzrumJY34DT',
'secret' => 'xTKZhcdz1EnS4E7slLbmiK9khgvYvwFcC1YAEWHvODJ+N1Vz',
'trusted_domains' =>
array (
0 => 'peakunited.co',
1 => '5.162.211.207',
2 => 'localhost',
),
'datadirectory' => '/home/peakunit/public_html/nextcloud/data',
'dbtype' => 'sqlite3',
'version' => '14.0.3.0',
'overwrite.cli.url' => 'https://peakunited.co/nextcloud',
'installed' => true,
'mail_from_address' => 'admin',
'mail_smtpmode' => 'smtp',
'mail_domain' => 'peakunited.co',
'mail_smtpauthtype' => 'LOGIN',
'mail_smtphost' => 'mail.peakunited.co',
'mail_smtpport' => '2525',
'mail_smtpauth' => 1,
'mail_smtpname' => 'admin@peakunited.co',
'mail_smtppassword' => '^vB^?C)J!DVN',
);
The output of your Apache/nginx/system log in /var/log/____:
I cannot find this in on the file manager server.