Please see the troubleshooting steps in the below TurboTax Help Article to see if they might help resolve your activation issue:
Troubleshoot blank screens, missing buttons, or missing images
Another potential cause is that your video card driver may not be compatible and may need to be updated. Please see the following help article for more information:
How do I fix blank screens during activation or in-product purchases in TurboTax Desktop for Windows...
If you continue to have issues with your software, please reach out to Customer Support.
What is the TurboTax phone number?
...OR use this:
.... this is the likely issue with anyone with a blank page during the running of Desktop TTX software.
.......TTX should only be installed and run as an Administrator..not in some guest account without administrator privileges...but it's hard to know each person's exact setup.
Exit TurboTax....then:
1) right click TurboTax 2018 icon
2) Select … Properties
3) Select the Compatibility tab
4) In the "Settings" box … check the box to "Run this program as an administrator"
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This has fixed the problem for a number of users now.
