All Follow-On Offering subscriptions are not guaranteed. This would depend on the demand for the offer and the number of shares that are available for allocation.
There are 2 ways to know how much shares you were able allocated with. You can check either one or both on the day after the COL offer deadline date.
For example: If the deadline date is on May 4, 2021 kindly check the status on May 5, 2021.
OPTION 1: Go to the PORTFOLIO page and click VIEW IPO REQUEST STATUS link
Here is a sample picture where you can find the VIEW IPO REQUEST STATUS link:
Here is a sample subscription status:
Here you see how many shares were allocated to you and the total value. The status can be either:
- FINAL - Shares are already allocated to you and will be credited to your COL account on the listing date of the stock. The Total Approved Value is already deducted from your COL account cash balance.
- NO ALLOCATION - No shares were allocated to your subscription. This can either be due to insufficient funds, subscription was more than the available shares and shares were raffled off or your account was not eligible for the offer.
OPTION 2: Go to the PORTFOLIO page and click VIEW MONTHLY ACCOUNT LEDGER (current) link
Here is a sample picture where you can find the VIEW MONTHLY ACCOUNT LEDGER (current) link: 
The ledger would show how much was debited from your COL account for your FOO subscription. This would also tell you how much shares to expect to be credited to your COL account on the listing date.
Here is a sample picture of a ledger entry for an FOO final allocation:
