# It is not possible to log on to ELO Sync
If you are unable to log on to ELO Sync, one or more of the following solutions may help you.
# Possible solutions
# Check whether the EULA has been accepted
If you are logged on as a normal user without administrator rights, you may not be able to log on if the EULA was not previously accepted by an administrator. Try to log on as an administrator and accept the EULA, or ask your administrator for help.
# Check whether the current user is assigned to ELO Sync
If you try to log on as a user without administrator rights, the user must first be assigned in order to use ELO Sync. Log on as an administrator and assign this default user, or ask your administrator for help.
# Check whether the correct URL is being used
This point is particularly important if ELO Sync is accessed via a proxy. Make that the URL used to access ELO Sync is also set as the 'PublicUrl' defined in the appsettings.json file. The same URL must also be used for the redirect URI in the Azure app registration.
# Make sure that the proxy entry is defined in the ELO proxy configuration
Check whether the de.elo.ix.plugin.auth.json file in the repository folder of the ELO installation directory contains the entry 'elo_sync_oauth'.
If the following value was changed in the appsettings.json file, make sure that the proxy configuration contains the correct OAuth key:
{
"OAuth": {
"ConfigId": "modified_oauth_key"
},
}