Hello Dinci5
This is happening because you are trying to configure unsupported scenario for CRM Online and Server Side Synchronization
technet.microsoft.com/.../dn531050.aspx
CRM Online Server Side Synchronization can be configured for Exchange Online or Pop/smtp (Gmail and Yahoo)
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CRM deployment
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Email system
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Email synchronization
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Appointments, contacts, and tasks synchronization
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Protocol
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CRM (on-premises)
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Yes
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Yes
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Exchange Web Services
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CRM (on-premises)
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Yes
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No
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POP3/SMTP
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Microsoft Dynamics CRM Online
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Exchange Online
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Yes
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Yes
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Exchange Web Services
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Microsoft Dynamics CRM Online
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Yes
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No
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POP3/SMTP
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If you want to use email feature in CRM Online I suggest you to configure Gmail or Yahoo for pop/smtp or use CRM Outlook to connect to O365 accounts and as last resource use Email Router configuration.
If you are using CRM Online trial with 25 licenses you could also use E3 trial that contains Exchange trial licenses so you could configure and do testing in your environment, this trial can be activated for 30 days inside O365 portal purchase menu.
Also it is important to know unsupported scenarios:
Using Exchange Online with CRM Online
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If your company is using Exchange Online with CRM Online, note the following:
CRM Online supports server-side synchronization with Exchange Online in the same tenant in Office 365 with Server to Server Authentication. Other authentication methods or settings are not recommended or supported, including:
• Using credentials specified by a user or queue
• Using credentials specified in an email server profile
• Using Impersonation
• Setting Auto Discover Server Location to No
• Using an email server profile other than Microsoft Exchange Online
• Using non-default network ports
Connecting CRM Online with Exchange Online in different tenant is not supported.
Unsupported email service configurations
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Server-side synchronization doesn’t support the following scenarios:
• Hybrid deployments:
o CRM Online with Exchange (on-premises)
o Microsoft Dynamics CRM (on-premises) with Exchange Online
• Mix of Exchange/SMTP and POP3/Exchange
• Creation of mass email marketing campaigns
• Extensibility scenarios like extending EWS/POP3/SMTP protocols and creating custom email providers
• Exchange Server 2003 and Exchange Server 2007
• Server-side synchronization in CRM Online, or in a Microsoft Dynamics CRM (on premises) deployment that is configured for FIPS 140-2 compliancy, requires a POP3/SMTP email server that is also FIPS 140-2 compliant. Some email servers are not FIPS 140-2 compliant, such as MSN, Outlook.com, or Windows Live Mail.
Best regards,