For enterprises managing hundreds of machines, Microsoft’s free can batch-convert Installation IDs to Confirmation IDs.
Activating Microsoft Office using the "telephone activation" method requires converting a unique into a Confirmation ID (CID) to validate your license. This manual process is typically used for perpetual (one-time purchase) versions like Office 2021, 2019, or 2016 when internet activation fails or is unavailable. 1. Locate Your Installation ID (IID)
The blue activation wizard vanished.
: Follow the automated prompts to enter your 63-digit Installation ID using your phone's keypad.
When installing Microsoft Office on a device without internet access, or when standard online activation fails, users are often directed to activate their product via the
: Enter your product key, then when prompted for the activation method, select "I want to activate the software by telephone" .