If so, you must ensure that Outlook is set to compose messages in HTML rather than plain text.
Step 1:bring up the Outlook app on your PC and click theFilemenu at the top-left corner.
Step 2:SelectOptionsfrom the left sidebar.
Step 3:In the Outlook Options window, switch to theMailtab.
Click thedrop-down menunext to Compose messages in this format and selectHTML.
Heres how to go about it.
Step 1:launch the Outlook app on your PC and go toFile>Options.
Step 2:Switch to theMailtab and click onSignatures.
Step 3:Click theNewbutton,namethe signature, and hitOK.
Step 4:Select your newly added signature andeditit.
Step 5:Click thedrop-down menusnext to New messages and Replies/forwards to select your new signature as default.
To check for this possibility, open Outlook in safe mode.
Hold down theCTRLkey and double-click theOutlook shortcut.
SelectYeswhen the confirmation prompt appears.
After Outlook opens in safe mode, verify if your signature is working properly.
If it is, one of the third-party add-ins is to blame.
To identify the culprit, disable all Outlook add-ins and re-enable them one at a time.
Step 1:In the Outlook app, go toFile>Options.
Step 2:In the Add-ins tab, use thedrop-down menunext to Manage to selectCOM Add-ins.
Then, click onGonext to it.
Step 3:Clear all the boxes to disable add-ins and clickOK.
Enable all your add-ins one at a time until the issue occurs again.
After you find the problematic add-in, consider removing it to resolve it for good.
Step 1:Press theWindows key + Rkeys to launch the Run dialog box.
Typeregeditin the box and pressEnter.
Step 2:SelectYeswhen the User Account Control (UAC) prompt appears.
Step 3:PressCtrl + Fto kick off the Find dialog box.
Type0006F03A-0000-0000-C000-000000000046in the text box and poke the Find Next button.
Step 4:Right-grab the located key and selectDelete.
Then, selectYesto confirm.
reset your PC after this, and test whether the issue persists.
Step 1:Right-tap on theStart iconand selectInstalled appsfrom the list.
Step 2:Scroll down to locate the Microsoft Office product on the list.
Click thethree-dot menu iconnext to it and selectModify.
Step 3:SelectQuick Repairand click onRepair.
If the issue persists, repeat the above steps and selectOnline Repair.
This process may take a while but will most likely fix the underlying issue.
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