SMTP windchill with microsoft 365

Version: Windchill 12.0

Use Case: after switching from gmail to microsoft 365 he no longer sends me mail

Description:

i have set
mail.properties
wt.mail.smtp.username=xxxxxxx
wt.mail.smtp.password=xxxxxxx
wt.properties
wt.mail.mailhost=smtp.office365.com:587
wt.mail.properties=\$(wt.home)\$(dir.sep)mail.properties
wt.mail.smtp.starttls.enable=true

site.xconf

<Property name="wt.mail.mailhost" overridable="true" targetFile="codebase/wt.properties"
value="smtp.office365.com:587"/>
<Property name="wt.mail.properties" overridable="true"
targetFile="codebase/wt.properties"
value="$(wt.home)$(dir.sep)mail.properties"/>
<Property name="wt.mail.smtp.starttls.enable" overridable="true"
targetFile="codebase/wt.properties"
value="true"/>

Where is the error?

Thanks