That can happen for a number of reasons.See:
unable to convert DL
Glenn Maxwell
13,141
Reputation points
Hi All
We are using exchange 2016 hybrid environment, we create users in onprem and migrate to online. i have a distribution List in exchange online. it has 5 members,This DL doesnot have any nested DLs. When i try to convert this DL to unified group i am getting the below error. i have added myself as a owner of the DL.
Exchange Online
Exchange Online
A cloud-based service included in Microsoft 365, delivering scalable messaging and collaboration features with simplified management and automatic updates.
Exchange | Exchange Server | Management
Exchange | Exchange Server | Management
The administration and maintenance of Microsoft Exchange Server to ensure secure, reliable, and efficient email and collaboration services across an organization.
Exchange | Hybrid management
Exchange | Hybrid management
The administration of a hybrid deployment that connects on-premises Exchange Server with Exchange Online, enabling seamless integration and centralized control.
Exchange | Other
Exchange | Other
A powerful email and collaboration platform developed by Microsoft, designed to support enterprise-level communication and productivity. Miscellaneous topics that do not fit into specific categories.
Answer accepted by question author
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Andy David - MVP 159.7K Reputation points MVP Volunteer Moderator2023-11-13T16:23:58.67+00:00
1 additional answer
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Anonymous
2023-11-21T07:43:29.4066667+00:00 Hello Glenn
Just to add in.
Hope it helps: Troubleshooting issues with Distribution List to Microsoft 365 Group upgrades
Regards
Shaofan